diff --git a/packages/kbn-esql-validation-autocomplete/src/autocomplete/autocomplete.test.ts b/packages/kbn-esql-validation-autocomplete/src/autocomplete/autocomplete.test.ts
index e463902554074..deb4592428089 100644
--- a/packages/kbn-esql-validation-autocomplete/src/autocomplete/autocomplete.test.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/autocomplete/autocomplete.test.ts
@@ -1123,7 +1123,7 @@ describe('autocomplete', () => {
           { filterText: '_source', text: '_source, ', command: TRIGGER_SUGGESTION_COMMAND },
         ]);
         // no comma if there are no more fields
-        testSuggestions('FROM a METADATA _id, _ignored, _index, _source, _version/', [
+        testSuggestions('FROM a METADATA _id, _ignored, _index, _source, _index_mode, _version/', [
           { filterText: '_version', text: '_version | ', command: TRIGGER_SUGGESTION_COMMAND },
         ]);
       });
diff --git a/packages/kbn-esql-validation-autocomplete/src/shared/constants.ts b/packages/kbn-esql-validation-autocomplete/src/shared/constants.ts
index c1942118a41e2..1a9f382d32a6d 100644
--- a/packages/kbn-esql-validation-autocomplete/src/shared/constants.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/shared/constants.ts
@@ -15,4 +15,4 @@ export const SINGLE_TICK_REGEX = /`/g;
 export const DOUBLE_BACKTICK = '``';
 export const SINGLE_BACKTICK = '`';
 
-export const METADATA_FIELDS = ['_version', '_id', '_index', '_source', '_ignored'];
+export const METADATA_FIELDS = ['_version', '_id', '_index', '_source', '_ignored', '_index_mode'];