Unexpected keyword argument called 'knn'

[jais001]

I am using ElasticsearchStore from the langchain vector stores, with Elasticsearch 7.9. While performing a similarity search with Elasticsearch store, I am getting an exception that states:
TypeError: Elasticsearch.search() got an unexpected keyword argument 'knn'

[joemcelroy]

Hi there,

knn which ElasticsearchStore uses by default, is not supported in Elasticsearch 7.9. I recommend updating to latest release (current is 8.9). You can read more about knn here https://www.elastic.co/guide/en/elasticsearch/reference/current/knn-search.html

Joe

[d1pankar]

I'm using elasticsearch==8.10.0 - still getting the same error TypeError: search() got an unexpected keyword argument 'knn'

[joemcelroy]

Is that the version of the client or both the elasticsearch instance and client are on 8.x?

that error does seem you’re on an old client version.