Kibana breaking changes

This section discusses the changes that you need to be aware of when migrating your application to Kibana 7.4.

Use search instead of msearch when batching is disabled

Details: When the advanced setting courier:batchSearches is disabled, we previously sent the search requests as _msearch requests. We now use _search when batching is disabled.

Impact: When the advanced setting courier:batchSearches is disabled, requests from Discover, Visualize, and Dashboard will now query Elasticsearch using the _search endpoint rather than the _msearch endpoint.