[ES|QL] Moves the @timestamp assignment to the ESQL util (#186158)

## Summary

This PR just moves the @timestamp assignment logic from the various
consumers to the helper function. It is much cleaner that way and I want
to add support of the named parameters so I want to have a central
function to accomplish this
https://github.com/elastic/kibana/issues/180805

packages/kbn-esql-utils/src/utils/get_esql_adhoc_dataview.ts

@@ -31,11 +31,19 @@ export async function getESQLAdHocDataview(
   indexPattern: string,
   dataViewsService: DataViewsPublicPluginStart
 ) {
-  return await dataViewsService.create({
+  const dataView = await dataViewsService.create({
     title: indexPattern,
     type: ESQL_TYPE,
     id: await sha256(`esql-${indexPattern}`),
   });
+
+  // If the indexPattern is empty string means that the user used either the ROW or META FUNCTIONS / SHOW INFO commands
+  // we don't want to add the @timestamp field in this case https://github.com/elastic/kibana/issues/163417
+  if (indexPattern && dataView?.fields?.getByName?.('@timestamp')?.type === 'date') {
+    dataView.timeFieldName = '@timestamp';
+  }
+
+  return dataView;
 }
 
 /**

src/plugins/discover/public/application/main/state_management/utils/get_esql_data_view.ts

@@ -21,14 +21,7 @@ export async function getEsqlDataView(
     currentDataView?.isPersisted() ||
     indexPatternFromQuery !== currentDataView?.getIndexPattern()
   ) {
-    const dataViewObj = await getESQLAdHocDataview(indexPatternFromQuery, services.dataViews);
-
-    // If the indexPatternFromQuery is empty string means that the user used either the ROW or SHOW META / SHOW INFO commands
-    // we don't want to add the @timestamp field in this case https://github.com/elastic/kibana/issues/163417
-    if (indexPatternFromQuery && dataViewObj.fields.getByName('@timestamp')?.type === 'date') {
-      dataViewObj.timeFieldName = '@timestamp';
-    }
-    return dataViewObj;
+    return await getESQLAdHocDataview(indexPatternFromQuery, services.dataViews);
   }
   return currentDataView;
 }

x-pack/plugins/data_visualizer/public/application/index_data_visualizer/search_strategy/requests/get_data_view_by_index_pattern.ts

@@ -6,6 +6,7 @@
  */
 
 import type { DataView, DataViewsContract } from '@kbn/data-views-plugin/public';
+import { getESQLAdHocDataview } from '@kbn/esql-utils';
 
 /**
  * Get a saved data view that matches the index pattern (as close as possible)
@@ -34,14 +35,7 @@ export async function getOrCreateDataViewByIndexPattern(
     indexPatternFromQuery &&
     (currentDataView?.isPersisted() || indexPatternFromQuery !== currentDataView?.getIndexPattern())
   ) {
-    const dataViewObj = await dataViews.create({
-      title: indexPatternFromQuery,
-    });
-
-    if (dataViewObj.fields.getByName('@timestamp')?.type === 'date') {
-      dataViewObj.timeFieldName = '@timestamp';
-    }
-    return dataViewObj;
+    return await getESQLAdHocDataview(indexPatternFromQuery, dataViews);
   }
   return currentDataView;
 }

x-pack/plugins/lens/public/app_plugin/shared/edit_on_the_fly/helpers.ts

@@ -36,10 +36,6 @@ export const getSuggestions = async (
       ? await deps.dataViews.create(dataViewSpec)
       : await getESQLAdHocDataview(indexPattern, deps.dataViews);
 
-    if (dataView.fields.getByName('@timestamp')?.type === 'date' && !dataViewSpec) {
-      dataView.timeFieldName = '@timestamp';
-    }
-
     const columns = await getESQLQueryColumns({
       esqlQuery: 'esql' in query ? query.esql : '',
       search: deps.data.search.search,

x-pack/plugins/lens/public/datasources/text_based/utils.ts

@@ -88,9 +88,6 @@ export async function getStateFromAggregateQuery(
     const dataView = await getESQLAdHocDataview(indexPattern, dataViews);
 
     if (dataView && dataView.id) {
-      if (dataView?.fields?.getByName('@timestamp')?.type === 'date') {
-        dataView.timeFieldName = '@timestamp';
-      }
       dataViewId = dataView?.id;
       indexPatternRefs = [
         ...indexPatternRefs,

x-pack/plugins/observability_solution/observability_ai_assistant_app/public/functions/visualize_esql.tsx

@@ -124,12 +124,7 @@ export function VisualizeESQL({
   }, [lens]);
 
   const dataViewAsync = useAsync(() => {
-    return getESQLAdHocDataview(indexPattern, dataViews).then((dataView) => {
-      if (dataView.fields.getByName('@timestamp')?.type === 'date') {
-        dataView.timeFieldName = '@timestamp';
-      }
-      return dataView;
-    });
+    return getESQLAdHocDataview(indexPattern, dataViews);
   }, [indexPattern, dataViews]);
 
   const chatFlyoutSecondSlotHandler = useContext(ObservabilityAIAssistantMultipaneFlyoutContext);