diff --git a/packages/kbn-monaco/src/index.ts b/packages/kbn-monaco/src/index.ts
index dcfcb5fbfc63f..41600d96ff7c9 100644
--- a/packages/kbn-monaco/src/index.ts
+++ b/packages/kbn-monaco/src/index.ts
@@ -22,7 +22,7 @@ import './register_globals';
 
 export { monaco } from './monaco_imports';
 export { XJsonLang } from './xjson';
-export { PainlessLang, PainlessContext } from './painless';
+export { PainlessLang, PainlessContext, PainlessAutocompleteField } from './painless';
 
 /* eslint-disable-next-line @kbn/eslint/module_migration */
 import * as BarePluginApi from 'monaco-editor/esm/vs/editor/editor.api';
diff --git a/packages/kbn-monaco/src/painless/index.ts b/packages/kbn-monaco/src/painless/index.ts
index 3c81f265f9b0d..4693fa2418b66 100644
--- a/packages/kbn-monaco/src/painless/index.ts
+++ b/packages/kbn-monaco/src/painless/index.ts
@@ -23,4 +23,4 @@ import { getSuggestionProvider } from './language';
 
 export const PainlessLang = { ID, getSuggestionProvider, lexerRules };
 
-export { PainlessContext } from './types';
+export { PainlessContext, PainlessAutocompleteField } from './types';
diff --git a/packages/kbn-monaco/src/painless/language.ts b/packages/kbn-monaco/src/painless/language.ts
index f64094dbb482e..b38dac2c7baf7 100644
--- a/packages/kbn-monaco/src/painless/language.ts
+++ b/packages/kbn-monaco/src/painless/language.ts
@@ -21,7 +21,7 @@ import { monaco } from '../monaco_imports';
 
 import { WorkerProxyService, EditorStateService } from './services';
 import { ID } from './constants';
-import { PainlessContext, Field } from './types';
+import { PainlessContext, PainlessAutocompleteField } from './types';
 import { PainlessWorker } from './worker';
 import { PainlessCompletionAdapter } from './completion_adapter';
 
@@ -38,7 +38,10 @@ monaco.languages.onLanguage(ID, async () => {
   workerProxyService.setup();
 });
 
-export const getSuggestionProvider = (context: PainlessContext, fields?: Field[]) => {
+export const getSuggestionProvider = (
+  context: PainlessContext,
+  fields?: PainlessAutocompleteField[]
+) => {
   editorStateService.setup(context, fields);
 
   return new PainlessCompletionAdapter(worker, editorStateService);
diff --git a/packages/kbn-monaco/src/painless/services/editor_state.ts b/packages/kbn-monaco/src/painless/services/editor_state.ts
index b54744152e34d..3003f266dca62 100644
--- a/packages/kbn-monaco/src/painless/services/editor_state.ts
+++ b/packages/kbn-monaco/src/painless/services/editor_state.ts
@@ -17,16 +17,16 @@
  * under the License.
  */
 
-import { PainlessContext, Field } from '../types';
+import { PainlessContext, PainlessAutocompleteField } from '../types';
 
 export interface EditorState {
   context: PainlessContext;
-  fields?: Field[];
+  fields?: PainlessAutocompleteField[];
 }
 
 export class EditorStateService {
   context: PainlessContext = 'painless_test';
-  fields: Field[] = [];
+  fields: PainlessAutocompleteField[] = [];
 
   public getState(): EditorState {
     return {
@@ -35,7 +35,7 @@ export class EditorStateService {
     };
   }
 
-  public setup(context: PainlessContext, fields?: Field[]) {
+  public setup(context: PainlessContext, fields?: PainlessAutocompleteField[]) {
     this.context = context;
 
     if (fields) {
diff --git a/packages/kbn-monaco/src/painless/types.ts b/packages/kbn-monaco/src/painless/types.ts
index 8afc3dc7ddd88..a56ca4f9b695a 100644
--- a/packages/kbn-monaco/src/painless/types.ts
+++ b/packages/kbn-monaco/src/painless/types.ts
@@ -51,7 +51,7 @@ export interface PainlessCompletionResult {
   suggestions: PainlessCompletionItem[];
 }
 
-export interface Field {
+export interface PainlessAutocompleteField {
   name: string;
   type: string;
 }
diff --git a/packages/kbn-monaco/src/painless/worker/lib/autocomplete.ts b/packages/kbn-monaco/src/painless/worker/lib/autocomplete.ts
index 5536da828be42..e8e795e99b259 100644
--- a/packages/kbn-monaco/src/painless/worker/lib/autocomplete.ts
+++ b/packages/kbn-monaco/src/painless/worker/lib/autocomplete.ts
@@ -23,7 +23,7 @@ import {
   PainlessCompletionResult,
   PainlessCompletionItem,
   PainlessContext,
-  Field,
+  PainlessAutocompleteField,
 } from '../../types';
 
 import {
@@ -124,7 +124,9 @@ export const getClassMemberSuggestions = (
   };
 };
 
-export const getFieldSuggestions = (fields: Field[]): PainlessCompletionResult => {
+export const getFieldSuggestions = (
+  fields: PainlessAutocompleteField[]
+): PainlessCompletionResult => {
   const suggestions: PainlessCompletionItem[] = fields.map(({ name }) => {
     return {
       label: name,
@@ -168,7 +170,7 @@ export const getConstructorSuggestions = (suggestions: Suggestion[]): PainlessCo
 export const getAutocompleteSuggestions = (
   painlessContext: PainlessContext,
   words: string[],
-  fields?: Field[]
+  fields?: PainlessAutocompleteField[]
 ): PainlessCompletionResult => {
   const suggestions = mapContextToData[painlessContext].suggestions;
   // What the user is currently typing
diff --git a/packages/kbn-monaco/src/painless/worker/painless_worker.ts b/packages/kbn-monaco/src/painless/worker/painless_worker.ts
index 357d81354ac43..9c39659519163 100644
--- a/packages/kbn-monaco/src/painless/worker/painless_worker.ts
+++ b/packages/kbn-monaco/src/painless/worker/painless_worker.ts
@@ -17,7 +17,7 @@
  * under the License.
  */
 
-import { PainlessCompletionResult, PainlessContext, Field } from '../types';
+import { PainlessCompletionResult, PainlessContext, PainlessAutocompleteField } from '../types';
 
 import { getAutocompleteSuggestions } from './lib';
 
@@ -25,7 +25,7 @@ export class PainlessWorker {
   public provideAutocompleteSuggestions(
     currentLineChars: string,
     context: PainlessContext,
-    fields?: Field[]
+    fields?: PainlessAutocompleteField[]
   ): PainlessCompletionResult {
     // Array of the active line words, e.g., [boolean, isTrue, =, true]
     const words = currentLineChars.replace('\t', '').split(' ');
diff --git a/x-pack/plugins/index_management/public/application/components/mappings_editor/components/runtime_fields/runtime_fields_list.tsx b/x-pack/plugins/index_management/public/application/components/mappings_editor/components/runtime_fields/runtime_fields_list.tsx
index dce5ad1657d38..4033c0f2fe456 100644
--- a/x-pack/plugins/index_management/public/application/components/mappings_editor/components/runtime_fields/runtime_fields_list.tsx
+++ b/x-pack/plugins/index_management/public/application/components/mappings_editor/components/runtime_fields/runtime_fields_list.tsx
@@ -78,7 +78,10 @@ export const RuntimeFieldsList = () => {
           docLinks: docLinks!,
           ctx: {
             namesNotAllowed: Object.values(runtimeFields).map((field) => field.source.name),
-            existingConcreteFields: Object.values(fields.byId).map((field) => field.source.name),
+            existingConcreteFields: Object.values(fields.byId).map((field) => ({
+              name: field.source.name,
+              type: field.source.type,
+            })),
           },
         },
         flyoutProps: {
diff --git a/x-pack/plugins/runtime_fields/README.md b/x-pack/plugins/runtime_fields/README.md
index e682d77f7a884..eb7b31e6e1154 100644
--- a/x-pack/plugins/runtime_fields/README.md
+++ b/x-pack/plugins/runtime_fields/README.md
@@ -90,8 +90,12 @@ interface Context {
    * An array of existing concrete fields. If the user gives a name to the runtime
    * field that matches one of the concrete fields, a callout will be displayed
    * to indicate that this runtime field will shadow the concrete field.
+   * This array is also used to provide the list of field autocomplete suggestions to the code editor
    */
-  existingConcreteFields?: string[];
+  existingConcreteFields?: Array<{
+    name: string;
+    type: string;
+  }>;
 }
 ```
 
diff --git a/x-pack/plugins/runtime_fields/public/components/runtime_field_editor/runtime_field_editor.test.tsx b/x-pack/plugins/runtime_fields/public/components/runtime_field_editor/runtime_field_editor.test.tsx
index a8f90810a1212..89f795633e9d1 100644
--- a/x-pack/plugins/runtime_fields/public/components/runtime_field_editor/runtime_field_editor.test.tsx
+++ b/x-pack/plugins/runtime_fields/public/components/runtime_field_editor/runtime_field_editor.test.tsx
@@ -78,7 +78,7 @@ describe('Runtime field editor', () => {
   });
 
   test('should accept a list of existing concrete fields and display a callout when shadowing one of the fields', async () => {
-    const existingConcreteFields = ['myConcreteField'];
+    const existingConcreteFields = [{ name: 'myConcreteField', type: 'keyword' }];
 
     testBed = setup({ onChange, docLinks, ctx: { existingConcreteFields } });
 
@@ -87,7 +87,7 @@ describe('Runtime field editor', () => {
     expect(exists('shadowingFieldCallout')).toBe(false);
 
     await act(async () => {
-      form.setInputValue('nameField.input', existingConcreteFields[0]);
+      form.setInputValue('nameField.input', existingConcreteFields[0].name);
     });
     component.update();
 
diff --git a/x-pack/plugins/runtime_fields/public/components/runtime_field_form/runtime_field_form.tsx b/x-pack/plugins/runtime_fields/public/components/runtime_field_form/runtime_field_form.tsx
index 2ed6df537a6fe..f64bdaacd7ff2 100644
--- a/x-pack/plugins/runtime_fields/public/components/runtime_field_form/runtime_field_form.tsx
+++ b/x-pack/plugins/runtime_fields/public/components/runtime_field_form/runtime_field_form.tsx
@@ -3,9 +3,9 @@
  * or more contributor license agreements. Licensed under the Elastic License;
  * you may not use this file except in compliance with the Elastic License.
  */
-import React, { useEffect } from 'react';
+import React, { useEffect, useState, useCallback } from 'react';
 import { i18n } from '@kbn/i18n';
-import { PainlessLang } from '@kbn/monaco';
+import { PainlessLang, PainlessContext } from '@kbn/monaco';
 import {
   EuiFlexGroup,
   EuiFlexItem,
@@ -28,7 +28,7 @@ import {
   ValidationFunc,
   FieldConfig,
 } from '../../shared_imports';
-import { RuntimeField } from '../../types';
+import { RuntimeField, RuntimeType } from '../../types';
 import { RUNTIME_FIELD_OPTIONS } from '../../constants';
 import { schema } from './schema';
 
@@ -38,6 +38,11 @@ export interface FormState {
   submit: FormHook<RuntimeField>['submit'];
 }
 
+interface Field {
+  name: string;
+  type: string;
+}
+
 export interface Props {
   links: {
     runtimePainless: string;
@@ -54,8 +59,9 @@ export interface Props {
      * An array of existing concrete fields. If the user gives a name to the runtime
      * field that matches one of the concrete fields, a callout will be displayed
      * to indicate that this runtime field will shadow the concrete field.
+     * It is also used to provide the list of field autocomplete suggestions to the code editor.
      */
-    existingConcreteFields?: string[];
+    existingConcreteFields?: Field[];
   };
 }
 
@@ -105,18 +111,51 @@ const getNameFieldConfig = (
   };
 };
 
+const mapReturnTypeToPainlessContext = (runtimeType: RuntimeType): PainlessContext => {
+  switch (runtimeType) {
+    case 'keyword':
+      return 'string_script_field_script_field';
+    case 'long':
+      return 'long_script_field_script_field';
+    case 'double':
+      return 'double_script_field_script_field';
+    case 'date':
+      return 'date_script_field';
+    case 'ip':
+      return 'ip_script_field_script_field';
+    case 'boolean':
+      return 'boolean_script_field_script_field';
+    default:
+      return 'string_script_field_script_field';
+  }
+};
+
 const RuntimeFieldFormComp = ({
   defaultValue,
   onChange,
   links,
   ctx: { namesNotAllowed, existingConcreteFields = [] } = {},
 }: Props) => {
+  const typeFieldConfig = schema.type as FieldConfig<RuntimeType, RuntimeField>;
+
+  const [painlessContext, setPainlessContext] = useState<PainlessContext>(
+    mapReturnTypeToPainlessContext(typeFieldConfig!.defaultValue!)
+  );
   const { form } = useForm<RuntimeField>({ defaultValue, schema });
   const { submit, isValid: isFormValid, isSubmitted } = form;
   const [{ name }] = useFormData<RuntimeField>({ form, watch: 'name' });
 
   const nameFieldConfig = getNameFieldConfig(namesNotAllowed, defaultValue);
 
+  const onTypeChange = useCallback((newType: Array<EuiComboBoxOptionOption<RuntimeType>>) => {
+    setPainlessContext(mapReturnTypeToPainlessContext(newType[0]!.value!));
+  }, []);
+
+  const suggestionProvider = PainlessLang.getSuggestionProvider(
+    painlessContext,
+    existingConcreteFields
+  );
+
   useEffect(() => {
     if (onChange) {
       onChange({ isValid: isFormValid, isSubmitted, submit });
@@ -145,7 +184,10 @@ const RuntimeFieldFormComp = ({
 
         {/* Return type */}
         <EuiFlexItem>
-          <UseField<EuiComboBoxOptionOption[]> path="type">
+          <UseField<Array<EuiComboBoxOptionOption<RuntimeType>>>
+            path="type"
+            onChange={onTypeChange}
+          >
             {({ label, value, setValue }) => {
               if (value === undefined) {
                 return null;
@@ -185,7 +227,7 @@ const RuntimeFieldFormComp = ({
         </EuiFlexItem>
       </EuiFlexGroup>
 
-      {existingConcreteFields.includes(name) && (
+      {existingConcreteFields.find((field) => field.name === name) && (
         <>
           <EuiSpacer />
           <EuiCallOut
@@ -237,6 +279,7 @@ const RuntimeFieldFormComp = ({
             >
               <CodeEditor
                 languageId={PainlessLang.ID}
+                suggestionProvider={suggestionProvider}
                 width="100%"
                 height="300px"
                 value={value}
@@ -250,6 +293,9 @@ const RuntimeFieldFormComp = ({
                   wordWrap: 'on',
                   wrappingIndent: 'indent',
                   automaticLayout: true,
+                  suggest: {
+                    snippetsPreventQuickSuggestions: false,
+                  },
                 }}
                 data-test-subj="scriptField"
                 aria-label={i18n.translate('xpack.runtimeFields.form.scriptEditorAriaLabel', {