Amazon OpenSearch is a fully managed, open-source search and analytics service that makes it easy to search and analyze data in real-time. It is based on Elasticsearch, a popular open-source search and analytics engine, and is fully compatible with Elasticsearch APIs, so you can easily migrate your existing Elasticsearch workloads to OpenSearch.

With Amazon OpenSearch, you can index and search large volumes of data across a wide range of use cases, including log analytics, full-text search, and application monitoring. You can easily scale your cluster up or down based on demand, and the service automatically manages the infrastructure for you, so you don't have to worry about provisioning or managing servers.