However, I don't know what you mean by a fleet server.

You have a couple of options:

• you can test FusionAuth with the database search option, which doesn't require elasticsearch, but offers more limited search capabilities: https://fusionauth.io/docs/lifecycle/manage-users/search/search#using-the-database-search-engine
• you could use our docker compose examples which are preconfigured to work with opensearch or elasticsearch: https://fusionauth.io/docs/get-started/download-and-install/docker

If you can provide a few more details about what you are trying to accomplish, I might be able to offer more guidance.