After completing the analysis and configuration for T318269: Test and analyze Kuromoji & Sudachi Japanese language analyzers, we decided that we are too far along into the OpenSearch migration to enable Sudachi for Elasticsearch; it would cause too many disruptions and complications.
Instead we will try to enable Sudachi after we migrate to OpenSearch. Since our first stop will be OpenSearch 1.x, we will need to port Sudachi to OpenSearch 1.x ourselves. The original project currently supports Elastic and OpenSearch 2.6+, so hopefully it won't be too difficult.