Elasticsearch: Rename public/app/plugins/datasource/elasticsearch/index_pattern.ts to follow convention (#55532)

* Elasticsearch: Rename public/app/plugins/datasource/elasticsearch/index_pattern.ts to follow convention

* undo change in this file

public/app/plugins/datasource/elasticsearch/IndexPattern.test.ts

@@ -2,7 +2,7 @@
 
 import { toUtc, getLocale, setLocale, dateTime } from '@grafana/data';
 
-import { IndexPattern } from '../index_pattern';
+import { IndexPattern } from './IndexPattern';
 
 describe('IndexPattern', () => {
   const originalLocale = getLocale();

public/app/plugins/datasource/elasticsearch/datasource.ts

@@ -33,6 +33,7 @@ import { getTemplateSrv, TemplateSrv } from 'app/features/templating/template_sr
 
 import { RowContextOptions } from '../../../features/logs/components/LogRowContextProvider';
 
+import { IndexPattern } from './IndexPattern';
 import LanguageProvider from './LanguageProvider';
 import { ElasticQueryBuilder } from './QueryBuilder';
 import { ElasticsearchAnnotationsQueryEditor } from './components/QueryEditor/AnnotationQueryEditor';
@@ -48,7 +49,6 @@ import {
 } from './components/QueryEditor/MetricAggregationsEditor/aggregations';
 import { metricAggregationConfig } from './components/QueryEditor/MetricAggregationsEditor/utils';
 import { ElasticResponse } from './elastic_response';
-import { IndexPattern } from './index_pattern';
 import { defaultBucketAgg, hasMetricOfType } from './queryDef';
 import { DataLinkConfig, ElasticsearchOptions, ElasticsearchQuery, TermsQuery } from './types';
 import { coerceESVersion, getScriptValue, isSupportedVersion } from './utils';