Invalid major version 2.5.0

I have two OpenSearch 2.5 clusters running in 2 AWS accounts (environments), dev and stg.
I use elasticsearch-spark-30_2.12-7.15.2.jar to write data to an index in OpenSearch.

dev works fine, but stg throws error below:

An error occurred while calling org.elasticsearch.hadoop.EsHadoopIllegalArgumentException: Cannot detect ES version - typically this happens if the network/Elasticsearch cluster is not accessible or when targeting a WAN/Cloud instance without the proper setting 'es.nodes.wan.only'

Then look further I spot this error:

org.elasticsearch.hadoop.EsHadoopIllegalStateException: Invalid major version [2.5.0]. Version is lower than minimum required version [6.x]

My dev and stg environments are created using cloud formation, they should be exactly identical. Both environments have OpenSearch 2.5. Why I could write to dev but not stg?

Also I think OpenSearch is forked from Elasticsearch 7.X so it's already higher then 6.X. Why the error message complains on 2.5.0 which is an OpenSearch version, not a elasticsearch version?

I tried elasticsearch-spark-30_2.12-8.9.0.jar, still have the same problem.

My elasticsearch-spark code to write to opensearch is, which works for dev:

            'es.nodes.wan.only', 'true'
            'es.nodes', 'my_domain_url'
            'es.port', '443'
            'es.resource', 'my_index',
            "es.write.operation", "upsert"
            "", "doc_id"
            "es.batch.size.entries", "100"
            "es.batch.write.retry.wait", "60s"
            "es.batch.write.retry.count", 6

Any one can shed some insight? I know this question has to do with OpenSearch, but since I am using elasticsearch-spark.jar, this question is valid on this board.

Thanks for your help!

OpenSearch/OpenDistro are AWS run products and differ from the original Elasticsearch and Kibana products that Elastic builds and maintains. You may need to contact them directly for further assistance.

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Why the error message complains on 2.5.0 which is an OpenSearch version, not a elasticsearch version?

Because elasticsearch-spark is only designed to work with Elasticsearch. It asks the cluster for its version, and gets told that it is "2.5" which is lower than 6

If you want help connecting from Spark to OpenSearch then you probably need to ask the OpenSearch project - elasticsearch-spark isn't intended to work for that.

Thanks for answering. But why elasticsearch-spark works in one of my environment?

Got it now, I just need to enable compatibility mode in OpenSearch, I perhaps did it in my dev domain but not doing it in stg domain:

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