[BUG] Opensearch 2.3 400 Bad Request: {"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Action/metadata line [1] contains an unknown parameter [_type]

[ahmednassar]

Describe the bug
I'm getting the below error with AWS opensearch_2.3, I tried to follow the fix in BUG but it does not work.

I confirmed the override_main_response_version as shown below,

aws opensearch describe-domain-config --domain-name opensearch-domain-1|grep override_main_response_version
                "override_main_response_version": "true",

[dblock]

The type parameter has been removed in OpenSearch 2.0. See https://opensearch.org/docs/2.0/breaking-changes/ and #1940. I'll close this issue, but happy to help if you're still stuck -
what are you using to write data (it needs to be compatible with OpenSearch 2.x)?

[lehmat]

Hi @dblock

I encountered the same error while following AWS guide to send cloudwatch logs to opensearch (on different account with VPC peering) HERE

It seems the "default" lambda that you delpoy directly from cloudwatch subscription filter (UI generated) holds the _type which breaks it:

I can confirm that removing the line in the image (or commenting it) fixes the issue

[dblock]

Thank @lehmat, I'll try to track this down. If you haven't opened a customer support ticket with AWS you should. They have a path to track all this stuff too.