Data Stream may already exist #43
Description
Is your feature request related to a problem? Please describe.
Plugin tries to create data stream when it doesn't need to, and data stream may already exist in some scenarios.
If data stream was created between check for data stream and PUT, retry operate would loop until finishing (concurrent execution problem):
https://github.com/fluent/fluent-plugin-opensearch/blob/main/lib/fluent/plugin/out_opensearch_data_stream.rb#L113
Describe the solution you'd like
allow _bulk POST to automatically create data streams matching the index template
Describe alternatives you've considered
N/A
Additional context
Data stream doesn't exist, so it will try to create
2022-03-31 16:28:32 +0000 [info]: #0 [out_all] Specified data stream does not exist. Will be created: <[404] {"error":{"root_cause":[{"type":"index_not_found_exception","reason":"no such index [my-data-stream]","index":"verrazzano-application-hello-helidon","resource.id":"my-data-stream","resource.type":"index_or_alias","index_uuid":"na"}],"type":"index_not_found_exception","reason":"no such index [my-data-stream]","index":"my-data-stream","resource.id":"my-data-streamn","resource.type":"index_or_alias","index_uuid":"na"},"status":404}>
Someone else had created the data stream between 16:28:32 and 16:28:34. Now we get 400 err from opensearch because the data stream is present now.
2022-03-31 16:28:34 +0000 [warn]: #0 [out_all] Could not communicate to OpenSearch, resetting connection and trying again. [400] {"error":{"root_cause":[{"type":"resource_already_exists_exception","reason":"data_stream [my-data-stream] already exists"}],"type":"resource_already_exists_exception","reason":"data_stream [my-data-stream] already exists"},"status":400}