Elassandra

What Elassandra is

Elassandra embeds OpenSearch in Apache Cassandra so each node provides distributed storage and search. Its maintained line targets Apache Cassandra 4.0.x, OpenSearch 1.3.x, and Java 11. An OpenSearch index maps to a Cassandra keyspace, while documents map to rows and indexed fields to columns or cells. Cassandra holds durable data; after a restart, Elassandra can replay that state and rebuild the local search view. Search requests can use the OpenSearch HTTP API or CQL, with standard OpenSearch-style responses. Schema can be created from an OpenSearch index or discovered from an existing Cassandra schema through OpenSearch mappings. Data placement follows Cassandra token ownership, and replication follows the keyspace settings. Deployment options include tarball, Debian package, RPM, Docker image, and Helm chart; integrations include OpenSearch plugins, OpenSearch Dashboards, and Spark. Elassandra requires the Murmur3 partitioner. Search indexing adds work to Cassandra writes, and immediate search visibility can increase write latency; synchronous refresh also adds cost. Its current line focuses on embedded OpenSearch, so advanced upstream features should be validated before production use.