diff --git a/packages/kbn-esql-validation-autocomplete/src/autocomplete/__tests__/helpers.ts b/packages/kbn-esql-validation-autocomplete/src/autocomplete/__tests__/helpers.ts
index 93fd194d93a54..fa16a3df7026f 100644
--- a/packages/kbn-esql-validation-autocomplete/src/autocomplete/__tests__/helpers.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/autocomplete/__tests__/helpers.ts
@@ -18,7 +18,6 @@ import * as autocomplete from '../autocomplete';
 import type { ESQLCallbacks } from '../../shared/types';
 import type { EditorContext, SuggestionRawDefinition } from '../types';
 import { TIME_SYSTEM_PARAMS, TRIGGER_SUGGESTION_COMMAND, getSafeInsertText } from '../factories';
-import { getFunctionSignatures } from '../../definitions/helpers';
 import { ESQLRealField } from '../../validation/types';
 import {
   FieldType,
@@ -214,13 +213,9 @@ export function getFunctionSignaturesByReturnType(
           label: name.toUpperCase(),
         };
       }
-      const printedSignatures = getFunctionSignatures(definition, {
-        withTypes: true,
-        capitalize: true,
-      });
       return {
         text: `${name.toUpperCase()}($0)`,
-        label: printedSignatures[0].declaration,
+        label: name.toUpperCase(),
       };
     });
 }
diff --git a/packages/kbn-esql-validation-autocomplete/src/autocomplete/factories.ts b/packages/kbn-esql-validation-autocomplete/src/autocomplete/factories.ts
index 43f6f8ccff365..85c8d035d33b1 100644
--- a/packages/kbn-esql-validation-autocomplete/src/autocomplete/factories.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/autocomplete/factories.ts
@@ -64,7 +64,7 @@ function getSafeInsertSourceText(text: string) {
 export function getSuggestionFunctionDefinition(fn: FunctionDefinition): SuggestionRawDefinition {
   const fullSignatures = getFunctionSignatures(fn, { capitalize: true, withTypes: true });
   return {
-    label: fullSignatures[0].declaration,
+    label: fn.name.toUpperCase(),
     text: `${fn.name.toUpperCase()}($0)`,
     asSnippet: true,
     kind: 'Function',
diff --git a/packages/kbn-esql-validation-autocomplete/src/validation/esql_validation_meta_tests.json b/packages/kbn-esql-validation-autocomplete/src/validation/esql_validation_meta_tests.json
index c66aaadf98df8..f1e71c9ff6a97 100644
--- a/packages/kbn-esql-validation-autocomplete/src/validation/esql_validation_meta_tests.json
+++ b/packages/kbn-esql-validation-autocomplete/src/validation/esql_validation_meta_tests.json
@@ -9976,7 +9976,7 @@
     {
       "query": "from index [METADATA _id, _source2]",
       "error": [
-        "Metadata field [_source2] is not available. Available metadata fields are: [_version, _id, _index, _source, _ignored]"
+        "Metadata field [_source2] is not available. Available metadata fields are: [_version, _id, _index, _source, _ignored, _index_mode]"
       ],
       "warning": [
         "Square brackets '[]' need to be removed from FROM METADATA declaration"
@@ -10014,7 +10014,7 @@
     {
       "query": "from index METADATA _id, _source2",
       "error": [
-        "Metadata field [_source2] is not available. Available metadata fields are: [_version, _id, _index, _source, _ignored]"
+        "Metadata field [_source2] is not available. Available metadata fields are: [_version, _id, _index, _source, _ignored, _index_mode]"
       ],
       "warning": []
     },