AWS Opensearch and NEST

Question

I am trying to connect to Opensearch Version 1.3 using the .net NEST library 7.17 from a .net Core app and I get the error:

**Elasticsearch.Net.UnsupportedProductException: 'The client noticed that the server is not Elasticsearch and we do not support this unknown product.'**

I tried downgrading to NEST 7.14.1 same issue!
Any help would be much appreciated!

Answer

Hi, it seems like the dot net client library([NEST](https://www.elastic.co/guide/en/elasticsearch/client/net-api/7.17/nest.html)) is not updated with OpenSearvch V1.3

The OpenSearch project was first [announced](https://aws.amazon.com/blogs/opensource/introducing-opensearch/) in January 2021 as an open-source fork of Elasticsearch 7.10.2.

Please enable the [compatibility mode](https://docs.aws.amazon.com/opensearch-service/latest/developerguide/rename.html) in the OpenSearch domain and try again with NEST.

Following command will enable compatibility mode in existing OpenSearch domain:

```
PUT /_cluster/settings
{
  "persistent" : {
    "compatibility.override_main_response_version" : true
  }
}
```

[![Compatibility Mode](/media/postImages/original/IMqdF_BJk4RBef3w8E30e40w)
]()

AWS Opensearch and NEST

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