This question is in reference to Atlassian Documentation: Bitbucket Server 4.6 release notes
This is documented in Install and configure a remote Elasticsearch instance:
Bitbucket Server 4.6+ comes with an bundled Elasticsearch instance, which runs as a separate process from the Bitbucket Server application and doesn't require any extra configuration. You can can also install a remote Elasticsearch instance on a remote machine, which can provide some advantages allocating memory resources.
More specifically, the page describes how to:
Migrate from using the bundled Elasticsearch instance to using a remote Elasticsearch instance
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