Add JSON_EXTRACT ES|QL scalar function

docs/changelog/142375.yaml

@@ -0,0 +1,5 @@
+pr: 142375
+summary: Add JSON_EXTRACT ES|QL scalar function
+area: ES|QL
+type: feature
+issues: []

docs/reference/query-languages/esql/_snippets/lists/string-functions.md

@@ -6,6 +6,7 @@
 * [`ENDS_WITH`](../../functions-operators/string-functions/ends_with.md)
 * [`FROM_BASE64`](../../functions-operators/string-functions/from_base64.md)
 * [`HASH`](../../functions-operators/string-functions/hash.md)
+* [`JSON_EXTRACT`](../../functions-operators/string-functions/json_extract.md)
 * [`LEFT`](../../functions-operators/string-functions/left.md)
 * [`LENGTH`](../../functions-operators/string-functions/length.md)
 * [`LOCATE`](../../functions-operators/string-functions/locate.md)

docs/reference/query-languages/esql/functions-operators/string-functions/json_extract.md

@@ -0,0 +1,10 @@
+---
+navigation_title: "JSON_EXTRACT"
+mapped_pages:
+  - https://www.elastic.co/guide/en/elasticsearch/reference/current/esql-functions-operators.html#esql-json_extract
+---
+
+# ES|QL `JSON_EXTRACT` function [esql-json_extract]
+
+:::{include} ../../_snippets/functions/layout/json_extract.md
+:::

docs/reference/query-languages/toc.yml

@@ -278,6 +278,7 @@ toc:
                   - file: esql/functions-operators/string-functions/ends_with.md
                   - file: esql/functions-operators/string-functions/from_base64.md
                   - file: esql/functions-operators/string-functions/hash.md
+                  - file: esql/functions-operators/string-functions/json_extract.md
                   - file: esql/functions-operators/string-functions/left.md
                   - file: esql/functions-operators/string-functions/length.md
                   - file: esql/functions-operators/string-functions/locate.md