Getting an unknown parameter error for "_type" while deploying fluentbit to send logs to AWS OpenSearch Serverless

[sid-819]

I am configuring fluentbit to send zabbix logs to Amazon OpenSearch Serverless. I have used the following under INPUT and OUTPUT section :
[INPUT]
name tail
path /var/log/zabbix/zabbix_agentd.log
tag zabbix_agent_logs
refresh_interval 5

[OUTPUT]
name opensearch
match zabbix_agent_logs
host
port 443
index zbx
tls On
aws_auth On
aws_region us-east-1
aws_service_name aoss

I am seeing following error in the fluentbit logfile. Is there anything that I am missing here ? :

[2023/09/22 12:54:59] [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}

[sid-819]

After configuring "Suppress_Type_Name On" in the OUTPUT block, this error was gone.