Java programmers interacting with Elasticsearch have traditionally used either the REST API over HTTP or the internal Java API for node-to-node communication, with the latter offering potential performance advantages by bypassing the JSON parsing step required by REST. However, the Java API presents challenges such as frequent breaking changes due to internal class updates, backward compatibility issues, and dependency complexities, which complicate upgrades and security. In contrast, the REST API offers greater stability and can be upgraded independently of the Elasticsearch cluster, simplifying security and compatibility. To address these issues, Elasticsearch introduced a low-level Java REST Client in version 5.0.0, offering advantages like compatibility with any Elasticsearch version, load balancing, failover capabilities, and minimal dependencies. The plan is to develop a high-level Java REST client to further ease the transition from the Java API by reusing existing requests and responses while not fully implementing the existing Client interface. This shift marks a strategic move towards phasing out the Java API, enhancing user experience, and improving feature development and security for Java users of Elasticsearch.