diff --git a/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts b/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts
index eec90bcd75c6a..a548287683e5c 100644
--- a/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/definitions/functions.ts
@@ -3268,16 +3268,6 @@ const mvCountDefinition: FunctionDefinition = {
       ],
       returnType: 'integer',
     },
-    {
-      params: [
-        {
-          name: 'field',
-          type: 'date_nanos',
-          optional: false,
-        },
-      ],
-      returnType: 'integer',
-    },
     {
       params: [
         {
@@ -3581,16 +3571,6 @@ const mvFirstDefinition: FunctionDefinition = {
       ],
       returnType: 'cartesian_shape',
     },
-    {
-      params: [
-        {
-          name: 'field',
-          type: 'date_nanos',
-          optional: false,
-        },
-      ],
-      returnType: 'date_nanos',
-    },
     {
       params: [
         {
@@ -3748,16 +3728,6 @@ const mvLastDefinition: FunctionDefinition = {
       ],
       returnType: 'cartesian_shape',
     },
-    {
-      params: [
-        {
-          name: 'field',
-          type: 'date_nanos',
-          optional: false,
-        },
-      ],
-      returnType: 'date_nanos',
-    },
     {
       params: [
         {
@@ -3895,16 +3865,6 @@ const mvMaxDefinition: FunctionDefinition = {
       ],
       returnType: 'boolean',
     },
-    {
-      params: [
-        {
-          name: 'field',
-          type: 'date_nanos',
-          optional: false,
-        },
-      ],
-      returnType: 'date_nanos',
-    },
     {
       params: [
         {
@@ -4085,16 +4045,6 @@ const mvMinDefinition: FunctionDefinition = {
       ],
       returnType: 'boolean',
     },
-    {
-      params: [
-        {
-          name: 'field',
-          type: 'date_nanos',
-          optional: false,
-        },
-      ],
-      returnType: 'date_nanos',
-    },
     {
       params: [
         {
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 91a4f120cf2dd..46bdf3c2a13d2 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
@@ -16333,21 +16333,6 @@
       "error": [],
       "warning": []
     },
-    {
-      "query": "from a_index | where mv_count(dateNanosField) > 0",
-      "error": [],
-      "warning": []
-    },
-    {
-      "query": "from a_index | eval var = mv_count(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
-    {
-      "query": "from a_index | eval mv_count(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
     {
       "query": "row var = mv_dedupe(true)",
       "error": [],
@@ -17311,16 +17296,6 @@
       "error": [],
       "warning": []
     },
-    {
-      "query": "from a_index | eval var = mv_first(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
-    {
-      "query": "from a_index | eval mv_first(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
     {
       "query": "row var = mv_last(true)",
       "error": [],
@@ -17810,16 +17785,6 @@
       "error": [],
       "warning": []
     },
-    {
-      "query": "from a_index | eval var = mv_last(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
-    {
-      "query": "from a_index | eval mv_last(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
     {
       "query": "row var = mv_max(true)",
       "error": [],
@@ -18140,16 +18105,6 @@
       "error": [],
       "warning": []
     },
-    {
-      "query": "from a_index | eval var = mv_max(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
-    {
-      "query": "from a_index | eval mv_max(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
     {
       "query": "row var = mv_median(5.5)",
       "error": [],
@@ -18620,16 +18575,6 @@
       "error": [],
       "warning": []
     },
-    {
-      "query": "from a_index | eval var = mv_min(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
-    {
-      "query": "from a_index | eval mv_min(dateNanosField)",
-      "error": [],
-      "warning": []
-    },
     {
       "query": "row var = mv_slice(true, 5, 5)",
       "error": [],
diff --git a/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts b/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts
index 15ca9cbfe6fbf..bd1de77be408a 100644
--- a/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts
+++ b/packages/kbn-esql-validation-autocomplete/src/validation/validation.test.ts
@@ -4473,9 +4473,6 @@ describe('validation logic', () => {
         testErrorsAndWarnings('row mv_count(to_geopoint("POINT (30 10)"))', []);
         testErrorsAndWarnings('row var = mv_count(to_geopoint(to_geopoint("POINT (30 10)")))', []);
         testErrorsAndWarnings('row var = mv_count(to_geoshape(to_geopoint("POINT (30 10)")))', []);
-        testErrorsAndWarnings('from a_index | where mv_count(dateNanosField) > 0', []);
-        testErrorsAndWarnings('from a_index | eval var = mv_count(dateNanosField)', []);
-        testErrorsAndWarnings('from a_index | eval mv_count(dateNanosField)', []);
       });
 
       describe('mv_dedupe', () => {
@@ -4779,8 +4776,6 @@ describe('validation logic', () => {
         testErrorsAndWarnings('row mv_first(to_geopoint("POINT (30 10)"))', []);
         testErrorsAndWarnings('row var = mv_first(to_geopoint(to_geopoint("POINT (30 10)")))', []);
         testErrorsAndWarnings('row var = mv_first(to_geoshape(to_geopoint("POINT (30 10)")))', []);
-        testErrorsAndWarnings('from a_index | eval var = mv_first(dateNanosField)', []);
-        testErrorsAndWarnings('from a_index | eval mv_first(dateNanosField)', []);
       });
 
       describe('mv_last', () => {
@@ -4931,8 +4926,6 @@ describe('validation logic', () => {
         testErrorsAndWarnings('row mv_last(to_geopoint("POINT (30 10)"))', []);
         testErrorsAndWarnings('row var = mv_last(to_geopoint(to_geopoint("POINT (30 10)")))', []);
         testErrorsAndWarnings('row var = mv_last(to_geoshape(to_geopoint("POINT (30 10)")))', []);
-        testErrorsAndWarnings('from a_index | eval var = mv_last(dateNanosField)', []);
-        testErrorsAndWarnings('from a_index | eval mv_last(dateNanosField)', []);
       });
 
       describe('mv_max', () => {
@@ -5020,8 +5013,6 @@ describe('validation logic', () => {
         testErrorsAndWarnings('row nullVar = null | eval mv_max(nullVar)', []);
         testErrorsAndWarnings('from a_index | eval mv_max("2022")', []);
         testErrorsAndWarnings('from a_index | eval mv_max(concat("20", "22"))', []);
-        testErrorsAndWarnings('from a_index | eval var = mv_max(dateNanosField)', []);
-        testErrorsAndWarnings('from a_index | eval mv_max(dateNanosField)', []);
       });
 
       describe('mv_median', () => {
@@ -5159,8 +5150,6 @@ describe('validation logic', () => {
         testErrorsAndWarnings('row nullVar = null | eval mv_min(nullVar)', []);
         testErrorsAndWarnings('from a_index | eval mv_min("2022")', []);
         testErrorsAndWarnings('from a_index | eval mv_min(concat("20", "22"))', []);
-        testErrorsAndWarnings('from a_index | eval var = mv_min(dateNanosField)', []);
-        testErrorsAndWarnings('from a_index | eval mv_min(dateNanosField)', []);
       });
 
       describe('mv_slice', () => {