diff --git a/x-pack/plugins/security/server/session_management/session_index.test.ts b/x-pack/plugins/security/server/session_management/session_index.test.ts
index 04991f4aeefd6..d0fb5a5d70f5e 100644
--- a/x-pack/plugins/security/server/session_management/session_index.test.ts
+++ b/x-pack/plugins/security/server/session_management/session_index.test.ts
@@ -446,6 +446,7 @@ describe('Session index', () => {
         {
           index: aliasName,
           keep_alive: '5m',
+          allow_partial_search_results: true,
         },
         { ignore: [404], meta: true }
       );
@@ -454,6 +455,7 @@ describe('Session index', () => {
         {
           index: aliasName,
           keep_alive: '5m',
+          allow_partial_search_results: true,
         },
         { meta: true }
       );
@@ -473,7 +475,6 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
-        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -556,7 +557,6 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
-        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -651,7 +651,6 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
-        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -740,7 +739,6 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
-        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
@@ -854,7 +852,6 @@ describe('Session index', () => {
       expect(mockElasticsearchClient.search).toHaveBeenCalledTimes(1);
       expect(mockElasticsearchClient.search).toHaveBeenCalledWith({
         _source_includes: 'usernameHash,provider',
-        allow_partial_search_results: true,
         sort: '_shard_doc',
         track_total_hits: false,
         search_after: undefined,
diff --git a/x-pack/plugins/security/server/session_management/session_index.ts b/x-pack/plugins/security/server/session_management/session_index.ts
index 9166ec9deb91f..b4bea1900c577 100644
--- a/x-pack/plugins/security/server/session_management/session_index.ts
+++ b/x-pack/plugins/security/server/session_management/session_index.ts
@@ -830,6 +830,10 @@ export class SessionIndex {
         {
           index: this.aliasName,
           keep_alive: SESSION_INDEX_CLEANUP_KEEP_ALIVE,
+          // @ts-expect-error client support this option, but it is not documented and typed yet.
+          // once support added we should remove this expected type error
+          // https://github.com/elastic/elasticsearch-specification/issues/3144
+          allow_partial_search_results: true,
         },
         { ignore: [404], meta: true }
       );
@@ -841,6 +845,10 @@ export class SessionIndex {
           {
             index: this.aliasName,
             keep_alive: SESSION_INDEX_CLEANUP_KEEP_ALIVE,
+            // @ts-expect-error client support this option, but it is not documented and typed yet.
+            // once support added we should remove this expected type error
+            // https://github.com/elastic/elasticsearch-specification/issues/3144
+            allow_partial_search_results: true,
           },
           { meta: true }
         ));
@@ -857,7 +865,6 @@ export class SessionIndex {
           size: SESSION_INDEX_CLEANUP_BATCH_SIZE,
           sort: '_shard_doc',
           track_total_hits: false, // for performance
-          allow_partial_search_results: true,
         });
         const { hits } = searchResponse.hits;
         if (hits.length > 0) {