Add additional index_types

[mishavay-aws]

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As an administrator configuring collectors that write to OpenSearch you want to configure index management policies scoped to particular index-name pattern.

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Define index_type for "otel_logs_source" and "otel_metrics_source" (and others) similar to ones defined for "trace-analytics-raw" and "trace-analytics-service-map"

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Without index_type defined, an index needs to be explicitly named, where it complicates creation of a scoped down policy in OpenSearch.

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[dlvenable]

This is a good idea. We'll want to be sure to align the approach with the OpenSearch simple schema that the observability plugin is supporting.

[juergen-walter]

@dlvenable is there a time horizon you want to tackle this feature? Or any blockers?

I could not find it on the timeline https://github.com/opensearch-project/data-prepper/projects/1

[juergen-walter]

Solution should incorporate the changes from #3342

[juergen-walter]

There is a PR #3929 for OpenTelemtry logs and metrics, reviews appreciated

[linghengqian]

This looks like a great PR. Does the OpenSearch Dashboard side have any pre-built visualization panels that correspond to this?