[8.x] [ES|QL] Update function metadata (elastic#201515) (elastic#201518)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[ES|QL] Update function metadata
(elastic#201515)](elastic#201515)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Kibana
Machine","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-11-25T07:10:24Z","message":"[ES|QL]
Update function metadata (elastic#201515)\n\nThis PR updates the function
definitions and inline docs based on the\r\nlatest metadata from
Elasticsearch.","sha":"30536b1d8c1d2eb8c7407d8c97cf3b0a46deb342","branchLabelMapping":{"^v9.0.0$":"main","^v8.18.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v9.0.0","Feature:ES|QL","Team:ESQL","backport:version","v8.18.0"],"title":"[ES|QL]
Update function
metadata","number":201515,"url":"https://github.com/elastic/kibana/pull/201515","mergeCommit":{"message":"[ES|QL]
Update function metadata (elastic#201515)\n\nThis PR updates the function
definitions and inline docs based on the\r\nlatest metadata from
Elasticsearch.","sha":"30536b1d8c1d2eb8c7407d8c97cf3b0a46deb342"}},"sourceBranch":"main","suggestedTargetBranches":["8.x"],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","branchLabelMappingKey":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/201515","number":201515,"mergeCommit":{"message":"[ES|QL]
Update function metadata (elastic#201515)\n\nThis PR updates the function
definitions and inline docs based on the\r\nlatest metadata from
Elasticsearch.","sha":"30536b1d8c1d2eb8c7407d8c97cf3b0a46deb342"}},{"branch":"8.x","label":"v8.18.0","branchLabelMappingKey":"^v8.18.0$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

packages/kbn-esql-validation-autocomplete/src/definitions/generated/aggregation_functions.ts

@@ -1341,6 +1341,56 @@ const stCentroidAggDefinition: FunctionDefinition = {
   examples: ['FROM airports\n| STATS centroid=ST_CENTROID_AGG(location)'],
 };
 
+// Do not edit this manually... generated by scripts/generate_function_definitions.ts
+const stdDevDefinition: FunctionDefinition = {
+  type: 'agg',
+  name: 'std_dev',
+  description: i18n.translate('kbn-esql-validation-autocomplete.esql.definitions.std_dev', {
+    defaultMessage: 'The standard deviation of a numeric field.',
+  }),
+  preview: false,
+  alias: undefined,
+  signatures: [
+    {
+      params: [
+        {
+          name: 'number',
+          type: 'double',
+          optional: false,
+        },
+      ],
+      returnType: 'double',
+    },
+    {
+      params: [
+        {
+          name: 'number',
+          type: 'integer',
+          optional: false,
+        },
+      ],
+      returnType: 'double',
+    },
+    {
+      params: [
+        {
+          name: 'number',
+          type: 'long',
+          optional: false,
+        },
+      ],
+      returnType: 'double',
+    },
+  ],
+  supportedCommands: ['stats', 'inlinestats', 'metrics'],
+  supportedOptions: undefined,
+  validate: undefined,
+  examples: [
+    'FROM employees\n| STATS STD_DEV(height)',
+    'FROM employees\n| STATS stddev_salary_change = STD_DEV(MV_MAX(salary_change))',
+  ],
+};
+
 // Do not edit this manually... generated by scripts/generate_function_definitions.ts
 const sumDefinition: FunctionDefinition = {
   type: 'agg',
@@ -1871,6 +1921,7 @@ export const aggregationFunctionDefinitions = [
   minDefinition,
   percentileDefinition,
   stCentroidAggDefinition,
+  stdDevDefinition,
   sumDefinition,
   topDefinition,
   valuesDefinition,

packages/kbn-language-documentation/src/sections/generated/aggregation_functions.tsx

@@ -318,6 +318,40 @@ export const functions = {
   FROM airports
   | STATS centroid=ST_CENTROID_AGG(location)
   \`\`\`
+  `,
+              description:
+                'Text is in markdown. Do not translate function names, special characters, or field names like sum(bytes)',
+              ignoreTag: true,
+            }
+          )}
+        />
+      ),
+    },
+    // Do not edit manually... automatically generated by scripts/generate_esql_docs.ts
+    {
+      label: i18n.translate('languageDocumentation.documentationESQL.std_dev', {
+        defaultMessage: 'STD_DEV',
+      }),
+      preview: false,
+      description: (
+        <Markdown
+          openLinksInNewTab
+          readOnly
+          enableSoftLineBreaks
+          markdownContent={i18n.translate(
+            'languageDocumentation.documentationESQL.std_dev.markdown',
+            {
+              defaultMessage: `<!--
+  This is generated by ESQL's AbstractFunctionTestCase. Do no edit it. See ../README.md for how to regenerate it.
+  -->
+
+  ### STD_DEV
+  The standard deviation of a numeric field.
+
+  \`\`\`
+  FROM employees
+  | STATS STD_DEV(height)
+  \`\`\`
   `,
               description:
                 'Text is in markdown. Do not translate function names, special characters, or field names like sum(bytes)',