diff --git a/x-pack/packages/ml/aiops_log_rate_analysis/api/actions.ts b/x-pack/packages/ml/aiops_log_rate_analysis/api/actions.ts
index 2348b32c32f8d..4c17f28c932b3 100644
--- a/x-pack/packages/ml/aiops_log_rate_analysis/api/actions.ts
+++ b/x-pack/packages/ml/aiops_log_rate_analysis/api/actions.ts
@@ -12,8 +12,6 @@ import type {
   SignificantItemGroupHistogram,
 } from '@kbn/ml-agg-utils';
 
-import type { AiopsLogRateAnalysisApiVersion as ApiVersion } from './schema';
-
 export const API_ACTION_NAME = {
   /** @since API v2 */
   ADD_SIGNIFICANT_ITEMS: 'add_significant_items',
@@ -23,13 +21,6 @@ export const API_ACTION_NAME = {
   ADD_SIGNIFICANT_ITEMS_GROUP: 'add_significant_items_group',
   /** @since API v2 */
   ADD_SIGNIFICANT_ITEMS_GROUP_HISTOGRAM: 'add_significant_items_group_histogram',
-  /** @deprecated since API v2 */
-  ADD_SIGNIFICANT_TERMS: 'add_significant_terms',
-  /** @deprecated since API v2 */
-  ADD_SIGNIFICANT_TERMS_HISTOGRAM: 'add_significant_terms_histogram',
-  /** @deprecated since API v2 */
-  ADD_SIGNIFICANT_TERMS_GROUP: 'add_significant_terms_group',
-  /** @deprecated since API v2 */
   ADD_SIGNIFICANT_TERMS_GROUP_HISTOGRAM: 'add_significant_terms_group_histogram',
   ADD_ERROR: 'add_error',
   PING: 'ping',
@@ -41,108 +32,60 @@ export const API_ACTION_NAME = {
 } as const;
 export type ApiActionName = typeof API_ACTION_NAME[keyof typeof API_ACTION_NAME];
 
-interface ApiActionAddSignificantItems<T extends ApiVersion> {
-  type: T extends '1'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_TERMS
-    : T extends '2'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS
-    : never;
+interface ApiActionAddSignificantItems {
+  type: typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS;
   payload: SignificantItem[];
 }
 
-export function addSignificantItemsAction<T extends ApiVersion>(
-  payload: ApiActionAddSignificantItems<T>['payload'],
-  version: T
-): ApiActionAddSignificantItems<T> {
-  if (version === '1') {
-    return {
-      type: API_ACTION_NAME.ADD_SIGNIFICANT_TERMS,
-      payload,
-    } as ApiActionAddSignificantItems<T>;
-  }
-
+export function addSignificantItemsAction(
+  payload: ApiActionAddSignificantItems['payload']
+): ApiActionAddSignificantItems {
   return {
     type: API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS,
     payload,
-  } as ApiActionAddSignificantItems<T>;
+  };
 }
 
-interface ApiActionAddSignificantItemsHistogram<T extends ApiVersion> {
-  type: T extends '1'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_TERMS_HISTOGRAM
-    : T extends '2'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_HISTOGRAM
-    : never;
+interface ApiActionAddSignificantItemsHistogram {
+  type: typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_HISTOGRAM;
   payload: SignificantItemHistogram[];
 }
 
-export function addSignificantItemsHistogramAction<T extends ApiVersion>(
-  payload: ApiActionAddSignificantItemsHistogram<T>['payload'],
-  version: T
-): ApiActionAddSignificantItemsHistogram<T> {
-  if (version === '1') {
-    return {
-      type: API_ACTION_NAME.ADD_SIGNIFICANT_TERMS_HISTOGRAM,
-      payload,
-    } as ApiActionAddSignificantItemsHistogram<T>;
-  }
-
+export function addSignificantItemsHistogramAction(
+  payload: ApiActionAddSignificantItemsHistogram['payload']
+): ApiActionAddSignificantItemsHistogram {
   return {
     type: API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_HISTOGRAM,
     payload,
-  } as ApiActionAddSignificantItemsHistogram<T>;
+  };
 }
 
-interface ApiActionAddSignificantItemsGroup<T extends ApiVersion> {
-  type: T extends '1'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_TERMS_GROUP
-    : T extends '2'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_GROUP
-    : never;
+interface ApiActionAddSignificantItemsGroup {
+  type: typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_GROUP;
   payload: SignificantItemGroup[];
 }
 
-export function addSignificantItemsGroupAction<T extends ApiVersion>(
-  payload: ApiActionAddSignificantItemsGroup<T>['payload'],
-  version: T
-): ApiActionAddSignificantItemsGroup<T> {
-  if (version === '1') {
-    return {
-      type: API_ACTION_NAME.ADD_SIGNIFICANT_TERMS_GROUP,
-      payload,
-    } as ApiActionAddSignificantItemsGroup<T>;
-  }
-
+export function addSignificantItemsGroupAction(
+  payload: ApiActionAddSignificantItemsGroup['payload']
+): ApiActionAddSignificantItemsGroup {
   return {
     type: API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_GROUP,
     payload,
-  } as ApiActionAddSignificantItemsGroup<T>;
+  };
 }
 
-interface ApiActionAddSignificantItemsGroupHistogram<T extends ApiVersion> {
-  type: T extends '1'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_TERMS_GROUP_HISTOGRAM
-    : T extends '2'
-    ? typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_GROUP_HISTOGRAM
-    : never;
+interface ApiActionAddSignificantItemsGroupHistogram {
+  type: typeof API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_GROUP_HISTOGRAM;
   payload: SignificantItemGroupHistogram[];
 }
 
-export function addSignificantItemsGroupHistogramAction<T extends ApiVersion>(
-  payload: ApiActionAddSignificantItemsGroupHistogram<T>['payload'],
-  version: T
-): ApiActionAddSignificantItemsGroupHistogram<T> {
-  if (version === '1') {
-    return {
-      type: API_ACTION_NAME.ADD_SIGNIFICANT_TERMS_GROUP_HISTOGRAM,
-      payload,
-    } as ApiActionAddSignificantItemsGroupHistogram<T>;
-  }
-
+export function addSignificantItemsGroupHistogramAction(
+  payload: ApiActionAddSignificantItemsGroupHistogram['payload']
+): ApiActionAddSignificantItemsGroupHistogram {
   return {
     type: API_ACTION_NAME.ADD_SIGNIFICANT_ITEMS_GROUP_HISTOGRAM,
     payload,
-  } as ApiActionAddSignificantItemsGroupHistogram<T>;
+  };
 }
 
 interface ApiActionAddError {
@@ -225,11 +168,11 @@ export function setZeroDocsFallback(
   };
 }
 
-export type AiopsLogRateAnalysisApiAction<T extends ApiVersion> =
-  | ApiActionAddSignificantItems<T>
-  | ApiActionAddSignificantItemsGroup<T>
-  | ApiActionAddSignificantItemsHistogram<T>
-  | ApiActionAddSignificantItemsGroupHistogram<T>
+export type AiopsLogRateAnalysisApiAction =
+  | ApiActionAddSignificantItems
+  | ApiActionAddSignificantItemsGroup
+  | ApiActionAddSignificantItemsHistogram
+  | ApiActionAddSignificantItemsGroupHistogram
   | ApiActionAddError
   | ApiActionPing
   | ApiActionResetAll
diff --git a/x-pack/packages/ml/aiops_log_rate_analysis/api/schema.ts b/x-pack/packages/ml/aiops_log_rate_analysis/api/schema.ts
index a7fbcfd303b55..fae5d17c67fdb 100644
--- a/x-pack/packages/ml/aiops_log_rate_analysis/api/schema.ts
+++ b/x-pack/packages/ml/aiops_log_rate_analysis/api/schema.ts
@@ -5,17 +5,12 @@
  * 2.0.
  */
 
-import type { AiopsLogRateAnalysisSchemaV1 } from './schema_v1';
 import type { AiopsLogRateAnalysisSchemaV2 } from './schema_v2';
 
-export type AiopsLogRateAnalysisApiVersion = '1' | '2';
+export type AiopsLogRateAnalysisApiVersion = '2';
 
 const LATEST_API_VERSION: AiopsLogRateAnalysisApiVersion = '2';
 
 export type AiopsLogRateAnalysisSchema<
   T extends AiopsLogRateAnalysisApiVersion = typeof LATEST_API_VERSION
-> = T extends '1'
-  ? AiopsLogRateAnalysisSchemaV1
-  : T extends '2'
-  ? AiopsLogRateAnalysisSchemaV2
-  : never;
+> = T extends '2' ? AiopsLogRateAnalysisSchemaV2 : never;
diff --git a/x-pack/packages/ml/aiops_log_rate_analysis/api/schema_v1.ts b/x-pack/packages/ml/aiops_log_rate_analysis/api/schema_v1.ts
deleted file mode 100644
index de059bca1235e..0000000000000
--- a/x-pack/packages/ml/aiops_log_rate_analysis/api/schema_v1.ts
+++ /dev/null
@@ -1,42 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import type { TypeOf } from '@kbn/config-schema';
-import { schema } from '@kbn/config-schema';
-
-export const aiopsLogRateAnalysisSchemaV1 = schema.object({
-  start: schema.number(),
-  end: schema.number(),
-  searchQuery: schema.string(),
-  timeFieldName: schema.string(),
-  includeFrozen: schema.maybe(schema.boolean()),
-  grouping: schema.maybe(schema.boolean()),
-  /** Analysis selection time ranges */
-  baselineMin: schema.number(),
-  baselineMax: schema.number(),
-  deviationMin: schema.number(),
-  deviationMax: schema.number(),
-  /** The index to query for log rate analysis */
-  index: schema.string(),
-  /** Settings to override headers derived compression and flush fix */
-  compressResponse: schema.maybe(schema.boolean()),
-  flushFix: schema.maybe(schema.boolean()),
-  /** Overrides to skip steps of the analysis with existing data */
-  overrides: schema.maybe(
-    schema.object({
-      loaded: schema.maybe(schema.number()),
-      remainingFieldCandidates: schema.maybe(schema.arrayOf(schema.string())),
-      // TODO Improve schema
-      significantTerms: schema.maybe(schema.arrayOf(schema.any())),
-      regroupOnly: schema.maybe(schema.boolean()),
-    })
-  ),
-  /** Probability used for the random sampler aggregations */
-  sampleProbability: schema.maybe(schema.number()),
-});
-
-export type AiopsLogRateAnalysisSchemaV1 = TypeOf<typeof aiopsLogRateAnalysisSchemaV1>;
diff --git a/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.test.ts b/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.test.ts
index bd318e6de0875..ea1c33e569fce 100644
--- a/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.test.ts
+++ b/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.test.ts
@@ -38,24 +38,21 @@ describe('streamReducer', () => {
   it('adds significant item, then resets all state again', () => {
     const state1 = streamReducer(
       initialState,
-      addSignificantItemsAction(
-        [
-          {
-            key: 'the-field-name:the-field-value',
-            type: 'keyword',
-            fieldName: 'the-field-name',
-            fieldValue: 'the-field-value',
-            doc_count: 10,
-            bg_count: 100,
-            total_doc_count: 1000,
-            total_bg_count: 10000,
-            score: 0.1,
-            pValue: 0.01,
-            normalizedScore: 0.123,
-          },
-        ],
-        '2'
-      )
+      addSignificantItemsAction([
+        {
+          key: 'the-field-name:the-field-value',
+          type: 'keyword',
+          fieldName: 'the-field-name',
+          fieldValue: 'the-field-value',
+          doc_count: 10,
+          bg_count: 100,
+          total_doc_count: 1000,
+          total_bg_count: 10000,
+          score: 0.1,
+          pValue: 0.01,
+          normalizedScore: 0.123,
+        },
+      ])
     );
 
     expect(state1.significantItems).toHaveLength(1);
@@ -66,14 +63,14 @@ describe('streamReducer', () => {
   });
 
   it('adds significant items and groups, then resets groups only', () => {
-    const state1 = streamReducer(initialState, addSignificantItemsAction(significantTerms, '2'));
+    const state1 = streamReducer(initialState, addSignificantItemsAction(significantTerms));
 
     expect(state1.significantItems).toHaveLength(4);
     expect(state1.significantItemsGroups).toHaveLength(0);
 
     const state2 = streamReducer(
       state1,
-      addSignificantItemsGroupAction(finalSignificantItemGroups, '2')
+      addSignificantItemsGroupAction(finalSignificantItemGroups)
     );
 
     expect(state2.significantItems).toHaveLength(4);
diff --git a/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.ts b/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.ts
index 2e3117b4326e8..ca6148c133cca 100644
--- a/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.ts
+++ b/x-pack/packages/ml/aiops_log_rate_analysis/api/stream_reducer.ts
@@ -10,7 +10,7 @@ import type { SignificantItem, SignificantItemGroup } from '@kbn/ml-agg-utils';
 import type { AiopsLogRateAnalysisApiAction } from './actions';
 import { API_ACTION_NAME } from './actions';
 
-interface StreamState {
+export interface StreamState {
   ccsWarning: boolean;
   significantItems: SignificantItem[];
   significantItemsGroups: SignificantItemGroup[];
@@ -34,7 +34,7 @@ export const initialState: StreamState = {
 
 export function streamReducer(
   state: StreamState,
-  action: AiopsLogRateAnalysisApiAction<'2'> | Array<AiopsLogRateAnalysisApiAction<'2'>>
+  action: AiopsLogRateAnalysisApiAction | AiopsLogRateAnalysisApiAction[]
 ): StreamState {
   if (Array.isArray(action)) {
     return action.reduce(streamReducer, state);
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/grouping_handler.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/grouping_handler.ts
index 233aa62985bef..5266858e6d3bc 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/grouping_handler.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/grouping_handler.ts
@@ -46,7 +46,6 @@ export const groupingHandlerFactory =
     logDebugMessage,
     logger,
     stateHandler,
-    version,
   }: ResponseStreamFetchOptions<T>) =>
   async (
     significantCategories: SignificantItem[],
@@ -134,7 +133,7 @@ export const groupingHandlerFactory =
         const maxItems = Math.max(...significantItemGroups.map((g) => g.group.length));
 
         if (maxItems > 1) {
-          responseStream.push(addSignificantItemsGroupAction(significantItemGroups, version));
+          responseStream.push(addSignificantItemsGroupAction(significantItemGroups));
         }
 
         stateHandler.loaded(PROGRESS_STEP_GROUPING, false);
@@ -203,15 +202,6 @@ export const groupingHandlerFactory =
                   doc_count: 0,
                 };
 
-                if (version === '1') {
-                  return {
-                    key: o.key,
-                    key_as_string: o.key_as_string ?? '',
-                    doc_count_significant_term: current.doc_count,
-                    doc_count_overall: Math.max(0, o.doc_count - current.doc_count),
-                  };
-                }
-
                 return {
                   key: o.key,
                   key_as_string: o.key_as_string ?? '',
@@ -221,15 +211,12 @@ export const groupingHandlerFactory =
               }) ?? [];
 
             responseStream.push(
-              addSignificantItemsGroupHistogramAction(
-                [
-                  {
-                    id: cpg.id,
-                    histogram,
-                  },
-                ],
-                version
-              )
+              addSignificantItemsGroupHistogramAction([
+                {
+                  id: cpg.id,
+                  histogram,
+                },
+              ])
             );
           }
         }, MAX_CONCURRENT_QUERIES);
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/histogram_handler.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/histogram_handler.ts
index 077c2162a30fd..1a61edde6864b 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/histogram_handler.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/histogram_handler.ts
@@ -41,7 +41,6 @@ export const histogramHandlerFactory =
     requestBody,
     responseStream,
     stateHandler,
-    version,
   }: ResponseStreamFetchOptions<T>) =>
   async (
     fieldValuePairsCount: number,
@@ -132,14 +131,6 @@ export const histogramHandlerFactory =
               ) ?? {
                 doc_count: 0,
               };
-              if (version === '1') {
-                return {
-                  key: o.key,
-                  key_as_string: o.key_as_string ?? '',
-                  doc_count_significant_term: current.doc_count,
-                  doc_count_overall: Math.max(0, o.doc_count - current.doc_count),
-                };
-              }
 
               return {
                 key: o.key,
@@ -154,16 +145,13 @@ export const histogramHandlerFactory =
           stateHandler.loaded((1 / fieldValuePairsCount) * PROGRESS_STEP_HISTOGRAMS, false);
           pushHistogramDataLoadingState();
           responseStream.push(
-            addSignificantItemsHistogramAction(
-              [
-                {
-                  fieldName,
-                  fieldValue,
-                  histogram,
-                },
-              ],
-              version
-            )
+            addSignificantItemsHistogramAction([
+              {
+                fieldName,
+                fieldValue,
+                histogram,
+              },
+            ])
           );
         }
       }, MAX_CONCURRENT_QUERIES);
@@ -237,15 +225,6 @@ export const histogramHandlerFactory =
               doc_count: 0,
             };
 
-            if (version === '1') {
-              return {
-                key: o.key,
-                key_as_string: o.key_as_string ?? '',
-                doc_count_significant_term: current.doc_count,
-                doc_count_overall: Math.max(0, o.doc_count - current.doc_count),
-              };
-            }
-
             return {
               key: o.key,
               key_as_string: o.key_as_string ?? '',
@@ -259,16 +238,13 @@ export const histogramHandlerFactory =
         stateHandler.loaded((1 / fieldValuePairsCount) * PROGRESS_STEP_HISTOGRAMS, false);
         pushHistogramDataLoadingState();
         responseStream.push(
-          addSignificantItemsHistogramAction(
-            [
-              {
-                fieldName,
-                fieldValue,
-                histogram,
-              },
-            ],
-            version
-          )
+          addSignificantItemsHistogramAction([
+            {
+              fieldName,
+              fieldValue,
+              histogram,
+            },
+          ])
         );
       }
     }
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/significant_items_handler.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/significant_items_handler.ts
index 6fb9f97cde4ef..aa2aa1944e64a 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/significant_items_handler.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/significant_items_handler.ts
@@ -38,7 +38,6 @@ export const significantItemsHandlerFactory =
     requestBody,
     responseStream,
     stateHandler,
-    version,
   }: ResponseStreamFetchOptions<T>) =>
   async ({
     fieldCandidates,
@@ -54,21 +53,11 @@ export const significantItemsHandlerFactory =
 
     const significantCategories: SignificantItem[] = [];
 
-    if (version === '1') {
-      significantCategories.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'1'>).overrides?.significantTerms?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.LOG_PATTERN
-        ) ?? [])
-      );
-    }
-
-    if (version === '2') {
-      significantCategories.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.LOG_PATTERN
-        ) ?? [])
-      );
-    }
+    significantCategories.push(
+      ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
+        (d) => d.type === SIGNIFICANT_ITEM_TYPE.LOG_PATTERN
+      ) ?? [])
+    );
 
     // Get significant categories of text fields
     if (textFieldCandidates.length > 0) {
@@ -85,27 +74,17 @@ export const significantItemsHandlerFactory =
       );
 
       if (significantCategories.length > 0) {
-        responseStream.push(addSignificantItemsAction(significantCategories, version));
+        responseStream.push(addSignificantItemsAction(significantCategories));
       }
     }
 
     const significantTerms: SignificantItem[] = [];
 
-    if (version === '1') {
-      significantTerms.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'1'>).overrides?.significantTerms?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.KEYWORD
-        ) ?? [])
-      );
-    }
-
-    if (version === '2') {
-      significantTerms.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.KEYWORD
-        ) ?? [])
-      );
-    }
+    significantTerms.push(
+      ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
+        (d) => d.type === SIGNIFICANT_ITEM_TYPE.KEYWORD
+      ) ?? [])
+    );
 
     const fieldsToSample = new Set<string>();
 
@@ -157,7 +136,7 @@ export const significantItemsHandlerFactory =
         });
         significantTerms.push(...pValues);
 
-        responseStream.push(addSignificantItemsAction(pValues, version));
+        responseStream.push(addSignificantItemsAction(pValues));
       }
 
       responseStream.push(
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/top_items_handler.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/top_items_handler.ts
index cc15c8b616995..f29b372116f48 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/top_items_handler.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/analysis_handlers/top_items_handler.ts
@@ -39,7 +39,6 @@ export const topItemsHandlerFactory =
     requestBody,
     responseStream,
     stateHandler,
-    version,
   }: ResponseStreamFetchOptions<T>) =>
   async ({
     fieldCandidates,
@@ -55,21 +54,11 @@ export const topItemsHandlerFactory =
 
     const topCategories: SignificantItem[] = [];
 
-    if (version === '1') {
-      topCategories.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'1'>).overrides?.significantTerms?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.LOG_PATTERN
-        ) ?? [])
-      );
-    }
-
-    if (version === '2') {
-      topCategories.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.LOG_PATTERN
-        ) ?? [])
-      );
-    }
+    topCategories.push(
+      ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
+        (d) => d.type === SIGNIFICANT_ITEM_TYPE.LOG_PATTERN
+      ) ?? [])
+    );
 
     // Get categories of text fields
     if (textFieldCandidates.length > 0) {
@@ -86,27 +75,17 @@ export const topItemsHandlerFactory =
       );
 
       if (topCategories.length > 0) {
-        responseStream.push(addSignificantItemsAction(topCategories, version));
+        responseStream.push(addSignificantItemsAction(topCategories));
       }
     }
 
     const topTerms: SignificantItem[] = [];
 
-    if (version === '1') {
-      topTerms.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'1'>).overrides?.significantTerms?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.KEYWORD
-        ) ?? [])
-      );
-    }
-
-    if (version === '2') {
-      topTerms.push(
-        ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
-          (d) => d.type === SIGNIFICANT_ITEM_TYPE.KEYWORD
-        ) ?? [])
-      );
-    }
+    topTerms.push(
+      ...((requestBody as AiopsLogRateAnalysisSchema<'2'>).overrides?.significantItems?.filter(
+        (d) => d.type === SIGNIFICANT_ITEM_TYPE.KEYWORD
+      ) ?? [])
+    );
 
     const fieldsToSample = new Set<string>();
 
@@ -158,7 +137,7 @@ export const topItemsHandlerFactory =
         });
         topTerms.push(...fetchedTopTerms);
 
-        responseStream.push(addSignificantItemsAction(fetchedTopTerms, version));
+        responseStream.push(addSignificantItemsAction(fetchedTopTerms));
       }
 
       responseStream.push(
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/define_route.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/define_route.ts
index de9df4aa5bdab..77fedfafb1896 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/define_route.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/define_route.ts
@@ -9,7 +9,6 @@ import type { CoreStart, IRouter } from '@kbn/core/server';
 import type { Logger } from '@kbn/logging';
 import type { DataRequestHandlerContext } from '@kbn/data-plugin/server';
 import type { UsageCounter } from '@kbn/usage-collection-plugin/server';
-import { aiopsLogRateAnalysisSchemaV1 } from '@kbn/aiops-log-rate-analysis/api/schema_v1';
 import { aiopsLogRateAnalysisSchemaV2 } from '@kbn/aiops-log-rate-analysis/api/schema_v2';
 import { AIOPS_API_ENDPOINT } from '@kbn/aiops-common/constants';
 
@@ -35,17 +34,6 @@ export const defineRoute = (
       path: AIOPS_API_ENDPOINT.LOG_RATE_ANALYSIS,
       access: 'internal',
     })
-    .addVersion(
-      {
-        version: '1',
-        validate: {
-          request: {
-            body: aiopsLogRateAnalysisSchemaV1,
-          },
-        },
-      },
-      routeHandlerFactory('1', license, logger, coreStart, usageCounter)
-    )
     .addVersion(
       {
         version: '2',
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_factory.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_factory.ts
index b676836adfa96..57e97ade7fb12 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_factory.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_factory.ts
@@ -56,7 +56,7 @@ export interface ResponseStreamFetchOptions<T extends ApiVersion> extends Respon
   responseStream: {
     end: () => void;
     endWithUpdatedLoadingState: () => void;
-    push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction<T>>['push'];
+    push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction>['push'];
     pushPingWithTimeout: () => void;
     pushError: (msg: string) => void;
   };
@@ -97,14 +97,14 @@ export const responseStreamFactory = <T extends ApiVersion>(options: ResponseStr
     end: streamEnd,
     push,
     responseWithHeaders,
-  } = streamFactory<AiopsLogRateAnalysisApiAction<T>>(
+  } = streamFactory<AiopsLogRateAnalysisApiAction>(
     headers,
     logger,
     requestBody.compressResponse,
     requestBody.flushFix
   );
 
-  const pushPingWithTimeout = streamPushPingWithTimeoutFactory<T>(state, push, logDebugMessage);
+  const pushPingWithTimeout = streamPushPingWithTimeoutFactory(state, push, logDebugMessage);
   const end = streamEndFactory(state, streamEnd, logDebugMessage);
   const endWithUpdatedLoadingState = streamEndWithUpdatedLoadingStateFactory(end, push);
   const pushError = streamPushErrorFactory(push, logDebugMessage);
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_end_with_updated_loading_state.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_end_with_updated_loading_state.ts
index 3ecb08fba480b..7765f6679d38d 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_end_with_updated_loading_state.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_end_with_updated_loading_state.ts
@@ -13,7 +13,6 @@ import {
   updateLoadingStateAction,
   type AiopsLogRateAnalysisApiAction,
 } from '@kbn/aiops-log-rate-analysis/api/actions';
-import type { AiopsLogRateAnalysisApiVersion as ApiVersion } from '@kbn/aiops-log-rate-analysis/api/schema';
 
 /**
  * Helper function that will push a message to the stream that it's done and
@@ -21,9 +20,9 @@ import type { AiopsLogRateAnalysisApiVersion as ApiVersion } from '@kbn/aiops-lo
  * This is implemented as a factory that receives the necessary dependencies
  * which then returns the actual helper function.
  */
-export const streamEndWithUpdatedLoadingStateFactory = <T extends ApiVersion>(
+export const streamEndWithUpdatedLoadingStateFactory = (
   streamEndCallback: () => void,
-  push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction<T>>['push']
+  push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction>['push']
 ) => {
   return function endWithUpdatedLoadingState() {
     push(
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_error.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_error.ts
index 87978b2561a35..92c3fb3661ae8 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_error.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_error.ts
@@ -7,7 +7,6 @@
 
 import type { StreamFactoryReturnType } from '@kbn/ml-response-stream/server';
 
-import type { AiopsLogRateAnalysisApiVersion as ApiVersion } from '@kbn/aiops-log-rate-analysis/api/schema';
 import {
   addErrorAction,
   type AiopsLogRateAnalysisApiAction,
@@ -20,8 +19,8 @@ import type { LogDebugMessage } from './log_debug_message';
  * This is implemented as a factory that receives the necessary dependencies
  * which then returns the actual helper function.
  */
-export const streamPushErrorFactory = <T extends ApiVersion>(
-  push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction<T>>['push'],
+export const streamPushErrorFactory = (
+  push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction>['push'],
   logDebugMessage: LogDebugMessage
 ) => {
   return function pushError(m: string) {
diff --git a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_ping_with_timeout.ts b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_ping_with_timeout.ts
index d570da39f277e..bcedc82d5f5c4 100644
--- a/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_ping_with_timeout.ts
+++ b/x-pack/plugins/aiops/server/routes/log_rate_analysis/response_stream_utils/stream_push_ping_with_timeout.ts
@@ -11,7 +11,6 @@ import {
   pingAction,
   type AiopsLogRateAnalysisApiAction,
 } from '@kbn/aiops-log-rate-analysis/api/actions';
-import type { AiopsLogRateAnalysisApiVersion as ApiVersion } from '@kbn/aiops-log-rate-analysis/api/schema';
 
 import type { LogDebugMessage } from './log_debug_message';
 import type { StateHandler } from './state_handler';
@@ -24,9 +23,9 @@ const PING_FREQUENCY = 10000;
  * This is implemented as a factory that receives the necessary dependencies
  * which then returns the actual helper function.
  */
-export const streamPushPingWithTimeoutFactory = <T extends ApiVersion>(
+export const streamPushPingWithTimeoutFactory = (
   stateHandler: StateHandler,
-  push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction<T>>['push'],
+  push: StreamFactoryReturnType<AiopsLogRateAnalysisApiAction>['push'],
   logDebugMessage: LogDebugMessage
 ) => {
   return function pushPingWithTimeout() {
diff --git a/x-pack/test/api_integration/apis/aiops/log_rate_analysis_full_analysis.ts b/x-pack/test/api_integration/apis/aiops/log_rate_analysis_full_analysis.ts
index 02086bbfe8b1c..b1a9fe2effb49 100644
--- a/x-pack/test/api_integration/apis/aiops/log_rate_analysis_full_analysis.ts
+++ b/x-pack/test/api_integration/apis/aiops/log_rate_analysis_full_analysis.ts
@@ -56,7 +56,7 @@ export default ({ getService }: FtrProviderContext) => {
               expect(typeof d.type).to.be('string');
             });
 
-            const addSignificantItemsActions = getAddSignificationItemsActions(data, apiVersion);
+            const addSignificantItemsActions = getAddSignificationItemsActions(data);
             expect(addSignificantItemsActions.length).to.greaterThan(
               0,
               'Expected significant items actions to be greater than 0.'
@@ -73,7 +73,7 @@ export default ({ getService }: FtrProviderContext) => {
               'Significant items do not match expected values.'
             );
 
-            const histogramActions = getHistogramActions(data, apiVersion);
+            const histogramActions = getHistogramActions(data);
             const histograms = histogramActions.flatMap((d) => d.payload);
             // for each significant term we should get a histogram
             expect(histogramActions.length).to.be(significantItems.length);
@@ -85,7 +85,7 @@ export default ({ getService }: FtrProviderContext) => {
               );
             });
 
-            const groupActions = getGroupActions(data, apiVersion);
+            const groupActions = getGroupActions(data);
             const groups = groupActions.flatMap((d) => d.payload);
 
             const actualGroups = orderBy(groups, ['docCount'], ['desc']);
@@ -98,7 +98,7 @@ export default ({ getService }: FtrProviderContext) => {
               )}, got ${JSON.stringify(actualGroups)}`
             );
 
-            const groupHistogramActions = getGroupHistogramActions(data, apiVersion);
+            const groupHistogramActions = getGroupHistogramActions(data);
             const groupHistograms = groupHistogramActions.flatMap((d) => d.payload);
             // for each significant terms group we should get a histogram
             expect(groupHistograms.length).to.be(groups.length);
diff --git a/x-pack/test/api_integration/apis/aiops/log_rate_analysis_groups_only.ts b/x-pack/test/api_integration/apis/aiops/log_rate_analysis_groups_only.ts
index 340f450a5f717..d3a7aaed19a40 100644
--- a/x-pack/test/api_integration/apis/aiops/log_rate_analysis_groups_only.ts
+++ b/x-pack/test/api_integration/apis/aiops/log_rate_analysis_groups_only.ts
@@ -37,24 +37,13 @@ export default ({ getService }: FtrProviderContext) => {
       getLogRateAnalysisTestData<typeof apiVersion>().forEach((testData) => {
         let overrides: AiopsLogRateAnalysisSchema<typeof apiVersion>['overrides'] = {};
 
-        if (apiVersion === '1') {
-          overrides = {
-            loaded: 0,
-            remainingFieldCandidates: [],
-            significantTerms: testData.expected.significantItems,
-            regroupOnly: true,
-          } as AiopsLogRateAnalysisSchema<typeof apiVersion>['overrides'];
-        }
-
-        if (apiVersion === '2') {
-          overrides = {
-            loaded: 0,
-            remainingFieldCandidates: [],
-            significantItems: testData.expected
-              .significantItems as AiopsLogRateAnalysisSchemaSignificantItem[],
-            regroupOnly: true,
-          } as AiopsLogRateAnalysisSchema<typeof apiVersion>['overrides'];
-        }
+        overrides = {
+          loaded: 0,
+          remainingFieldCandidates: [],
+          significantItems: testData.expected
+            .significantItems as AiopsLogRateAnalysisSchemaSignificantItem[],
+          regroupOnly: true,
+        } as AiopsLogRateAnalysisSchema<typeof apiVersion>['overrides'];
 
         describe(`with v${apiVersion} - ${testData.testName}`, () => {
           before(async () => {
@@ -78,13 +67,13 @@ export default ({ getService }: FtrProviderContext) => {
               expect(typeof d.type).to.be('string');
             });
 
-            const addSignificantItemsActions = getAddSignificationItemsActions(data, apiVersion);
+            const addSignificantItemsActions = getAddSignificationItemsActions(data);
             expect(addSignificantItemsActions.length).to.eql(
               0,
               `Expected significant items actions to be 0, got ${addSignificantItemsActions.length}`
             );
 
-            const histogramActions = getHistogramActions(data, apiVersion);
+            const histogramActions = getHistogramActions(data);
 
             // for each significant item we should get a histogram
             expect(histogramActions.length).to.eql(
@@ -92,7 +81,7 @@ export default ({ getService }: FtrProviderContext) => {
               `Expected histogram actions to be 0, got ${histogramActions.length}`
             );
 
-            const groupActions = getGroupActions(data, apiVersion);
+            const groupActions = getGroupActions(data);
             const groups = groupActions.flatMap((d) => d.payload);
 
             expect(orderBy(groups, ['docCount'], ['desc'])).to.eql(
@@ -102,7 +91,7 @@ export default ({ getService }: FtrProviderContext) => {
               )}, got ${JSON.stringify(groups)}`
             );
 
-            const groupHistogramActions = getGroupHistogramActions(data, apiVersion);
+            const groupHistogramActions = getGroupHistogramActions(data);
             const groupHistograms = groupHistogramActions.flatMap((d) => d.payload);
             // for each significant items group we should get a histogram
             expect(groupHistograms.length).to.be(groups.length);
diff --git a/x-pack/test/api_integration/apis/aiops/test_data.ts b/x-pack/test/api_integration/apis/aiops/test_data.ts
index 63bf9940d959c..21f628d832c7d 100644
--- a/x-pack/test/api_integration/apis/aiops/test_data.ts
+++ b/x-pack/test/api_integration/apis/aiops/test_data.ts
@@ -25,7 +25,7 @@ import {
 
 import type { TestData } from './types';
 
-export const API_VERSIONS: ApiVersion[] = ['1', '2'];
+export const API_VERSIONS: ApiVersion[] = ['2'];
 
 export const getLogRateAnalysisTestData = <T extends ApiVersion>(): Array<TestData<T>> => [
   {
diff --git a/x-pack/test/api_integration/apis/aiops/test_helpers.ts b/x-pack/test/api_integration/apis/aiops/test_helpers.ts
index 5252d14fbb7f7..cf5f1d41ebbce 100644
--- a/x-pack/test/api_integration/apis/aiops/test_helpers.ts
+++ b/x-pack/test/api_integration/apis/aiops/test_helpers.ts
@@ -5,34 +5,16 @@
  * 2.0.
  */
 
-import type { AiopsLogRateAnalysisApiVersion as ApiVersion } from '@kbn/aiops-log-rate-analysis/api/schema';
+export const getAddSignificationItemsActions = (data: any[]) =>
+  data.filter((d) => d.type === 'add_significant_items');
 
-export const getAddSignificationItemsActions = (data: any[], apiVersion: ApiVersion) =>
-  data.filter(
-    (d) => d.type === (apiVersion === '1' ? 'add_significant_terms' : 'add_significant_items')
-  );
+export const getHistogramActions = (data: any[]) =>
+  data.filter((d) => d.type === 'add_significant_items_histogram');
 
-export const getHistogramActions = (data: any[], apiVersion: ApiVersion) =>
-  data.filter(
-    (d) =>
-      d.type ===
-      (apiVersion === '1' ? 'add_significant_terms_histogram' : 'add_significant_items_histogram')
-  );
+export const getGroupActions = (data: any[]) =>
+  data.filter((d) => d.type === 'add_significant_items_group');
 
-export const getGroupActions = (data: any[], apiVersion: ApiVersion) =>
-  data.filter(
-    (d) =>
-      d.type ===
-      (apiVersion === '1' ? 'add_significant_terms_group' : 'add_significant_items_group')
-  );
-
-export const getGroupHistogramActions = (data: any[], apiVersion: ApiVersion) =>
-  data.filter(
-    (d) =>
-      d.type ===
-      (apiVersion === '1'
-        ? 'add_significant_terms_group_histogram'
-        : 'add_significant_items_group_histogram')
-  );
+export const getGroupHistogramActions = (data: any[]) =>
+  data.filter((d) => d.type === 'add_significant_items_group_histogram');
 
 export const getErrorActions = (data: any[]) => data.filter((d) => d.type === 'add_error');
diff --git a/x-pack/test/api_integration_basic/apis/aiops/permissions.ts b/x-pack/test/api_integration_basic/apis/aiops/permissions.ts
index ed25731ffd5e3..239696215c759 100644
--- a/x-pack/test/api_integration_basic/apis/aiops/permissions.ts
+++ b/x-pack/test/api_integration_basic/apis/aiops/permissions.ts
@@ -17,7 +17,7 @@ import type {
 
 import type { FtrProviderContext } from '../../ftr_provider_context';
 
-const API_VERSIONS: ApiVersion[] = ['1', '2'];
+const API_VERSIONS: ApiVersion[] = ['2'];
 
 export default ({ getService }: FtrProviderContext) => {
   const supertest = getService('supertest');