[BUG] lack of opensearch sink initialization error logs when data-prepper is spinning up

Describe the bug
A user reported lack of opensearch sink initialization error logs when data-prepper is spinning up.

2023-06-12T22:52:21,382 [entry-pipeline-sink-worker-2-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [entry-pipeline] - sink is not ready for execution, retrying
2023-06-12T22:52:21,382 [service-map-pipeline-sink-worker-4-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [service-map-pipeline] - sink is not ready for execution, retrying
2023-06-12T22:52:21,383 [entry-pipeline-sink-worker-2-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [entry-pipeline] Waiting for Sink to be ready
2023-06-12T22:52:21,383 [service-map-pipeline-sink-worker-4-thread-1] INFO  org.opensearch.dataprepper.plugins.sink.opensearch.OpenSearchSink - Initializing OpenSearch sink
2023-06-12T22:52:21,383 [raw-pipeline-sink-worker-6-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [raw-pipeline] - sink is not ready for execution, retrying
2023-06-12T22:52:21,383 [raw-pipeline-sink-worker-6-thread-1] INFO  org.opensearch.dataprepper.plugins.sink.opensearch.OpenSearchSink - Initializing OpenSearch sink
2023-06-12T22:52:21,407 [main] WARN  org.opensearch.dataprepper.pipeline.server.HttpServerProvider - Creating Data Prepper server without TLS. This is not secure.
2023-06-12T22:52:21,407 [main] WARN  org.opensearch.dataprepper.pipeline.server.HttpServerProvider - In order to set up TLS for the Data Prepper server, go here: https://github.com/opensearch-project/data-prepper/blob/main/docs/configuration.md#server-configuration
2023-06-12T22:52:21,409 [raw-pipeline-sink-worker-6-thread-1] INFO  org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration - aws_sigv4 is set, will sign requests using AWSRequestSigningApacheInterceptor
2023-06-12T22:52:21,409 [service-map-pipeline-sink-worker-4-thread-1] INFO  org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration - aws_sigv4 is set, will sign requests using AWSRequestSigningApacheInterceptor
2023-06-12T22:52:21,425 [main] INFO  org.opensearch.dataprepper.pipeline.server.DataPrepperServer - Data Prepper server running at :4900
2023-06-12T22:52:21,883 [service-map-pipeline-sink-worker-4-thread-1] INFO  org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration - Using the trust all strategy
2023-06-12T22:52:21,883 [raw-pipeline-sink-worker-6-thread-1] INFO  org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration - Using the trust all strategy
2023-06-12T22:52:22,383 [entry-pipeline-sink-worker-2-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [entry-pipeline] - sink is not ready for execution, retrying
2023-06-12T22:52:23,383 [entry-pipeline-sink-worker-2-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [entry-pipeline] - sink is not ready for execution, retrying
2023-06-12T22:52:24,384 [entry-pipeline-sink-worker-2-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [entry-pipeline] - sink is not ready for execution, retrying
2023-06-12T22:52:25,384 [entry-pipeline-sink-worker-2-thread-1] INFO  org.opensearch.dataprepper.pipeline.Pipeline - Pipeline [entry-pipeline] - sink is not ready for execution, retrying

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• OS: [e.g. Ubuntu 20.04 LTS]
• Version [e.g. 22]

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