In the last chapter, we saw how one can work on improving the performance and scaling of Elasticsearch clusters. We learned many useful concepts such as query validations and query profiling. We then read about hot threads to identify the issues in the cluster and then did a detailed coverage of how to scale the Elasticsearch clusters under different loads and requirements. We finally ended the chapter after discussing two awesome features, index shrinking and rollover, which are introduced in Elasticsearch version 5.0.
In this chapter, we are going to learn one of the most interesting things, and that is developing Elasticsearch custom plugins. By the end of this chapter, we will have covered the following topics:
How to set up the Apache Maven project for Elasticsearch plugin development
How to develop a custom REST action plugin
How to develop a custom analysis plugin extending Elasticsearch analysis capabilities