How Elastic queries work and where it stores the data ? is it a server?

I am very new in elasticsearch , Elastic searh is a database? how the queries work in sense beta we write ? how it process is there any java api written to process these queries ?

Elastic searh is a database?

Kind of. You write documents to it. You can update, delete, get, search and compute.
Looks like it.
It depends on what you define as a database. Like:

how the queries work in sense beta we write ?

I don't understand the question. Can you clarify?

how it process is there any java api written to process these queries ?

Not sure I understand but here is the link to the Java Rest Clients: Java REST Client [7.17] | Elastic

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