Complementing Cassandra and Open Search

There is no direct way to connect AWS OpenSearch Service with Cassandra. However, to enable users to query their data in OpenSearch, data integration or ETL process can be used such as tools like Apache NiFi, Logstash (with an appropriate input plugin for Cassandra), or AWS Glue.

The process generally involves extracting data from Cassandra, transforming it, and then indexing it into OpenSearch cluster. Once in OpenSearch, user can perform search queries directly. Please refer to following link:

https://www.instaclustr.com/support/documentation/opensearch/using-opensearch/connecting-logstash-to-opensearch/