Elassandra

Elassandra is ranked #8 of 17 in wide-column databases on Freedom251. It runs on API, Linux, Self-hosted.

Compared on wide-column databases

Deployment model: self_hosted
Query interface: multiple
Consistency controls: tunable
Multi-region support: Yes
Transaction support: Yes
Horizontal scaling: Yes

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6.1

Elassandra

Purpose: Elassandra embeds OpenSearch inside Apache Cassandra so each node provides distributed storage and distributed search.
Maintained stack: The documented maintained line targets Apache Cassandra 4.0.x, OpenSearch 1.3.x, and Java 11.
Data model: Elassandra maps OpenSearch indices to Cassandra keyspaces, documents to rows, and indexed fields to columns or cells.
Durability: Cassandra is the durable storage layer, and restart recovery replays Cassandra state and can rebuild the local search view.
Scaling: Data placement follows Cassandra token ownership, and replica behavior follows Cassandra keyspace replication.
Search interfaces: Search requests can use the OpenSearch HTTP API or CQL, and Elassandra returns standard OpenSearch-style search responses.
Schema workflows: Elassandra supports creating Cassandra schema from an OpenSearch index or discovering an existing Cassandra schema through OpenSearch mappings.
Integrations: The documentation lists integration with OpenSearch plugins, OpenSearch Dashboards, and Spark.
Deployment options: The documentation lists tarball, Debian package, RPM, Docker image, and Helm chart installation options.
Index deletion limit: Deleting an index removes search metadata and files but does not delete its backing Cassandra keyspace or table by default.
Consistency limit: Document version fields such as _version, _seq_no, and _primary_term are not globally authoritative conflict controls.
Refresh trade-off: Immediate search visibility after a write trades off against write latency, and synchronous refresh adds cost.
Operational requirement: Elassandra requires the Murmur3 partitioner.
What it does: Elassandra embeds OpenSearch inside Apache Cassandra so each node serves distributed storage and distributed search.

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Where it ranks on Freedom251

Best Wide-Column Databases in 2026#8 of 17

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Sources

elassandra.org/en/latest/· checked 3 Oct 2026
elassandra.org/en/latest/architecture.html· checked 3 Oct 2026
elassandra.org/en/latest/limitations.html· checked 3 Oct 2026
elassandra.org/en/latest/mapping.html· checked 3 Oct 2026
elassandra.org/en/latest/quickstart.html· checked 3 Oct 2026