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.
* Update post-analytics-collection-event.asciidoc
Update API endpoint. Instead of `click`, it should be `search_click`.
Expanded on request body in the API as well.
* Update post-analytics-collection-event.asciidoc
* Update post-analytics-collection-event.asciidoc
* Update post-analytics-collection-event.asciidoc
