[9.2] [Metrics][Discover] Fix dimensions and values search being case sensitive (elastic#239110) (elastic#239197)

# Backport

This will backport the following commits from `main` to `9.2`:
- [[Metrics][Discover] Fix dimensions and values search being case
sensitive (elastic#239110)](elastic#239110)

<!--- Backport version: 10.1.0 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

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Fix dimensions and values search being case sensitive
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Fix dimensions and values search being case
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Fix dimensions and values search being case sensitive
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Fix dimensions and values search being case sensitive
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---------

Co-authored-by: kibanamachine <[email protected]>

Author: MiriamAparicio

src/platform/packages/shared/kbn-unified-metrics-grid/src/components/toolbar/dimensions_selector.tsx

@@ -12,6 +12,7 @@ import { FormattedMessage } from '@kbn/i18n-react';
 import { EuiFlexGroup, EuiFlexItem, EuiNotificationBadge } from '@elastic/eui';
 import { i18n } from '@kbn/i18n';
 import { ToolbarSelector, type SelectableEntry } from '@kbn/shared-ux-toolbar-selector';
+import { comboBoxFieldOptionMatcher } from '@kbn/field-utils';
 import { ClearAllSection } from './clear_all_section';
 import { MAX_DIMENSIONS_SELECTIONS } from '../../common/constants';
 
@@ -159,11 +160,7 @@ export const DimensionsSelector = ({
       data-selected-value={selectedDimensions}
       searchable
       buttonLabel={buttonLabel}
-      optionMatcher={({ option, normalizedSearchValue }) => {
-        return 'name' in option
-          ? String(option.name ?? '').includes(normalizedSearchValue)
-          : option.label.includes(normalizedSearchValue);
-      }}
+      optionMatcher={comboBoxFieldOptionMatcher}
       options={options}
       singleSelection={false}
       onChange={handleChange}

src/platform/packages/shared/kbn-unified-metrics-grid/src/components/toolbar/values_selector.tsx

@@ -20,6 +20,7 @@ import {
 } from '@elastic/eui';
 import type { TimeRange } from '@kbn/data-plugin/common';
 import { i18n } from '@kbn/i18n';
+import { comboBoxFieldOptionMatcher } from '@kbn/field-utils';
 import { FIELD_VALUE_SEPARATOR } from '../../common/constants';
 import { useDimensionsQuery } from '../../hooks';
 import { ClearAllSection } from './clear_all_section';
@@ -175,11 +176,7 @@ export const ValuesSelector = ({
       data-selected-value={selectedDimensions}
       searchable
       buttonLabel={buttonLabel}
-      optionMatcher={({ option, normalizedSearchValue }) => {
-        return 'name' in option
-          ? String(option.name ?? '').includes(normalizedSearchValue)
-          : option.label.includes(normalizedSearchValue);
-      }}
+      optionMatcher={comboBoxFieldOptionMatcher}
       options={options}
       singleSelection={false}
       hasArrow={!isLoading}

src/platform/packages/shared/kbn-unified-metrics-grid/tsconfig.json

@@ -32,5 +32,7 @@
     "@kbn/es-query",
     "@kbn/discover-utils",
     "@kbn/fields-metadata-plugin",
+    "@kbn/esql-utils",
+    "@kbn/field-utils"
   ]
 }