This document provides an overview of Elasticsearch including:
- Elasticsearch is a database server that is document-based and schema-free, built on Apache Lucene.
- It allows for full-text search across fields in documents and supports CRUD operations via a RESTful API.
- Common operations demonstrated include indexing, updating, retrieving, and deleting documents.
- Advanced search capabilities include filtering, phrase matching, and highlighting search terms.
- Analytics features like aggregations allow grouping and metrics like average age to be computed across document fields and buckets.