Kibana breaking changes

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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

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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.