# Knn Doesnt coexist with Seismic Sparse **URL:** \ **Category:** OpenSearch\ **Created:** [January 13, 2026, 10:31am UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709 "2026-01-13T10:31:15Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Nagpraveen](https://avatars.discourse-cdn.com/v4/letter/n/e495f1/32.png) [@Nagpraveen](https://forum.opensearch.org/u/Nagpraveen)\ **Post date:** [January 13, 2026, 10:31am UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/1 "2026-01-13T10:31:15Z")
**Versions** (relevant - OpenSearch/Dashboard/Server OS/Browser): 3.4 **Describe the issue** : The SEISMIC sparse model, which is an advancement over traditional sparse model, seems to have a plugin conflict when tried to enable knn as well. This means, we cannot index both seismic sparse and knn embeddings on the same index which prohibits hybrid search. But traditional sparse and knn have no issues, when ingested on same index. Attaching the screenshot. **Configuration** : index.sparse: true index.knn: true **Relevant Logs or Screenshots** : ![image](https://us1.discourse-cdn.com/flex019/uploads/mauve_hedgehog/original/2X/3/3280a162cd426fbc6296f76fbc489c65d7701da5.jpeg) ---
**Author:** ![Nagpraveen](https://avatars.discourse-cdn.com/v4/letter/n/e495f1/32.png) [@Nagpraveen](https://forum.opensearch.org/u/Nagpraveen)\ **Post date:** [January 20, 2026, 9:25am UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/2 "2026-01-20T09:25:25Z")
Any clarifications on this would be highly appreciated, Thanks! ---
**Author:** ![reta](https://avatars.discourse-cdn.com/v4/letter/r/cdc98d/32.png) [@reta](https://forum.opensearch.org/u/reta)\ **Post date:** [January 20, 2026, 12:49pm UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/3 "2026-01-20T12:49:06Z")
Hi @Nagpraveen , At the moment, due to the way both plugins implemented, it is not possible to create an index that has knn and seismic sparse enabled at the same time. We are working towards lifting this limitation off (see please [1]), but it may take some time. Thank you. [1] [Introduce CodecRegistry and EnginePlugin::getAdditionalCodecs hook to allow additional Codec registration by reta · Pull Request #20411 · opensearch-project/OpenSearch · GitHub](https://github.com/opensearch-project/OpenSearch/pull/20411) ---
**Author:** ![Nagpraveen](https://avatars.discourse-cdn.com/v4/letter/n/e495f1/32.png) [@Nagpraveen](https://forum.opensearch.org/u/Nagpraveen)\ **Post date:** [January 24, 2026, 7:42am UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/4 "2026-01-24T07:42:21Z")
@reta Amazing! Thank you for proposing the patch. ---
**Author:** ![Nagpraveen](https://avatars.discourse-cdn.com/v4/letter/n/e495f1/32.png) [@Nagpraveen](https://forum.opensearch.org/u/Nagpraveen)\ **Post date:** [January 27, 2026, 10:26am UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/5 "2026-01-27T10:26:50Z")
@reta : Can we expect this to be part of 3.5 release? ---
**Author:** ![reta](https://avatars.discourse-cdn.com/v4/letter/r/cdc98d/32.png) [@reta](https://forum.opensearch.org/u/reta)\ **Post date:** [January 27, 2026, 12:48pm UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/6 "2026-01-27T12:48:00Z")
@Nagpraveen unfortunately not, as I mentioned it make take some time (I would expect multiple changes / release to fully address the problem). ---
**Author:** ![Nagpraveen](https://avatars.discourse-cdn.com/v4/letter/n/e495f1/32.png) [@Nagpraveen](https://forum.opensearch.org/u/Nagpraveen)\ **Post date:** [January 28, 2026, 6:50am UTC](https://forum.opensearch.org/t/knn-doesnt-coexist-with-seismic-sparse/27709/7 "2026-01-28T06:50:40Z")
@reta : Understood, Thank you !