opensearch-project/OpenSearch — reverse-engineered prompt

Build me an open source search server like OpenSearch. I want to run it locally, send JSON documents to it through simple HTTP endpoints, have it store and index messy text data, and then search it with fast, relevant results.

It should feel like a real backend service, not a toy demo, with clear startup commands, sensible configuration, logs, health checks, and a small client example that shows how to add data and query it. Please make it in Java and keep the code organized so extra modules or plugins could be added later.

Include tests for the main API behavior and a short README explaining how to build it, run it, index a few sample records, and search them. Look up current docs online if you need to.