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

[suresh-iitr]

Hello, team! I am trying to send cpu metrics from fluentbit to opensearch. Getting error: [2022/10/25 16:10:07] [error] [output:opensearch:opensearch.0] HTTP status=400 URI=/_bulk, response:
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Action/metadata line [1] contains an unknown parameter [_type]"}],"type":"illegal_argument_exception","reason":"Action/metadata line [1] contains an unknown parameter [_type]"},"status":400} (edited)
4:15
Fluentbit command is : ./fluent-bit -i cpu -t cpu -o opensearch -p Host=10.12.3.193 -p Port=9200 -p Index=my_index -m '' -o stdout -m '' -f 5 (edited)
4:18
I tried to configure the opensearch using "compatibility.override_main_response_version" : true; ref: #3484; still no use. I am getting the error. Please help me

[dblock]

This is a dup, see #4864 (comment) for details and next steps.