diff --git a/src/legacy/ui/public/field_editor/components/scripting_help/test_script.js b/src/legacy/ui/public/field_editor/components/scripting_help/test_script.js
index 04a457c118e555..9b20d93ed19088 100644
--- a/src/legacy/ui/public/field_editor/components/scripting_help/test_script.js
+++ b/src/legacy/ui/public/field_editor/components/scripting_help/test_script.js
@@ -29,12 +29,16 @@ import {
   EuiSpacer,
   EuiTitle,
   EuiCallOut,
+  EuiFieldText,
 } from '@elastic/eui';
 
+import { i18n } from '@kbn/i18n';
+
 export class TestScript extends Component {
   state = {
     isLoading: false,
     additionalFields: [],
+    searchQuery: '',
   }
 
   componentDidMount() {
@@ -65,6 +69,7 @@ export class TestScript extends Component {
       lang,
       script,
       indexPatternTitle: indexPattern.title,
+      additionalQuery: this.state.searchQuery,
       additionalFields: this.state.additionalFields.map(option => {
         return option.value;
       })
@@ -181,6 +186,22 @@ export class TestScript extends Component {
           />
         </EuiFormRow>
 
+        <EuiFormRow label="Search query">
+
+          <EuiFieldText
+            placeholder={i18n.translate('common.ui.savedObjects.finder.searchPlaceholder', {
+              defaultMessage: 'Search query…',
+            })}
+            value={this.state.searchQuery}
+            onChange={e => {
+              this.setState({
+                searchQuery: e.target.value,
+              });
+            }}
+          />
+
+        </EuiFormRow>
+
         <EuiButton
           onClick={this.previewScript}
           disabled={this.props.script ? false : true}
@@ -201,7 +222,7 @@ export class TestScript extends Component {
           <h3>Preview results</h3>
           <p>
             Run your script to preview the first 10 results. You can also select some
-            additional fields to include in your results to gain more context.
+            additional fields to include in your results to gain more context or add a query to filter on specific documents.
           </p>
         </EuiText>
         <EuiSpacer />
diff --git a/src/legacy/ui/public/field_editor/lib/validate_script.js b/src/legacy/ui/public/field_editor/lib/validate_script.js
index f8940447abc68b..3f01d42e5f6afd 100644
--- a/src/legacy/ui/public/field_editor/lib/validate_script.js
+++ b/src/legacy/ui/public/field_editor/lib/validate_script.js
@@ -19,7 +19,7 @@
 
 import { kfetch } from 'ui/kfetch';
 
-export const executeScript = async ({ name, lang, script, indexPatternTitle, additionalFields = [] }) => {
+export const executeScript = async ({ name, lang, script, indexPatternTitle, additionalQuery = '', additionalFields = [] }) => {
   // Using _msearch because _search with index name in path dorks everything up
   const header = {
     index: indexPatternTitle,
@@ -46,6 +46,10 @@ export const executeScript = async ({ name, lang, script, indexPatternTitle, add
     search._source = additionalFields;
   }
 
+  if (additionalQuery !== '') {
+    search.query = { query_string: { query: additionalQuery } };
+  }
+
   const body = `${JSON.stringify(header)}\n${JSON.stringify(search)}\n`;
   const esResp = await kfetch({ method: 'POST', pathname: '/elasticsearch/_msearch', body });
   // unwrap _msearch response