[DOCS] Update links to migrating Search docs (#100237)

Some Search docs are migrating from Enterprise Search to Elasticsearch.
Update links to these docs to use the new locations. Also update
titles and surrounding text.

docs/reference/behavioral-analytics/apis/post-analytics-collection-event.asciidoc

@@ -40,8 +40,8 @@ Post an event to an Analytics Collection.
 
 [[post-analytics-collection-event-request-body]]
 ==== {api-request-body-title}
-Full request body parameters can be found in {enterprise-search-ref}/analytics-events-reference.html[Enterprise Analytics Events^].
 
+Full request body parameters can be found in: <<behavioral-analytics-event-reference>>.
 
 [[post-analytics-collection-event-prereqs]]
 ==== {api-prereq-title}

docs/reference/ingest.asciidoc

@@ -448,11 +448,11 @@ configuration. See {fleet-guide}/install-standalone-elastic-agent.html[Install s
 
 [discrete]
 [[pipelines-in-enterprise-search]]
-=== Pipelines in Enterprise Search
+=== Pipelines for search indices
 
-When you create Elasticsearch indices for {enterprise-search-ref}/index.html[Enterprise Search^] use cases, for example, using the {enterprise-search-ref}/crawler.html[web crawler^] or {enterprise-search-ref}/connectors.html[connectors^], these indices are automatically set up with specific ingest pipelines. 
+When you create Elasticsearch indices for search use cases, for example, using the {enterprise-search-ref}/crawler.html[web crawler^] or {enterprise-search-ref}/connectors.html[connectors^], these indices are automatically set up with specific ingest pipelines.
 These processors help optimize your content for search.
-Refer to the {enterprise-search-ref}/ingest-pipelines.html[Enterprise Search documentation^] for more information.
+See <<ingest-pipeline-search>> for more information.
 
 [discrete]
 [[access-source-fields]]