Provide an OpenSearch API source

[dlvenable]

Is your feature request related to a problem? Please describe.

I'd like to be able to point existing OpenSearch clients that perform ingestion to Data Prepper instead.

Describe the solution you'd like

Create a new source - opensearch_api which supports the Document APIs that perform ingestion.

Minimally, this can be:

source:
  opensearch_api:

Some more options:

source:
  opensearch_api:
    port: 9200
    ssl: true
    ssl_certificate_file: /path/to/certificate
    ssl_key_file: /path/to/private.key
    thread_count: 200
    path_prefix: opensearch/
    authentication:
      http_basic:
        username: ingest_client
        password: ${{aws_secrets:ingest:password}}

Additional context

This can start with only the _bulk API and this could supersede #248. Over time we can add the other endpoints as well.

This would be available for _bulk using the path:

https://localhost:9200/_bulk

Tasks

• OpenSearch Bulk API Source #248
• Support other ingestion APIs

[dlvenable]

We may also want to make the REST APIs configurable so that users can enable only some.

For example.

source:
  opensearch_api:
    apis: [bulk, index, update, delete]

[dlvenable]

Ideally, we can combine much of this code with the http source. It may be good to add a new project to Data Prepper for http-server-common which supports common HTTP code. Much of the code can be similar between the opensearch_api source and the http source.