Erroneous Beam Deprecation warnings are confusing Bigquery IO users.
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Description
Bigquery sink is marked deprecated: https://github.com/apache/beam/blob/32e2e3e910619d400568073dde0d7b36698a416a/sdks/python/apache_beam/io/gcp/bigquery.py#L499, however it is used by Dataflow runner in codepath that processes WriteToBigQuery https://github.com/apache/beam/blob/32e2e3e910619d400568073dde0d7b36698a416a/sdks/python/apache_beam/runners/dataflow/dataflow_runner.py#L680.
This generates a warning message for all BQ users, including those who use WriteToBigQuery: "Warning: BigQuerySink is deprecated since 2.11.0. Use WriteToBigQuery instead".
This message is a red herring and confuses BQ users.
One possibility to address this is to make BigQuerySink an alias for _BigQuerySink, and use _BigQuerySink internally.
Imported from Jira [BEAM-7686](https://issues.apache.org/jira/browse/BEAM-7686). Original Jira may contain additional context.
Reported by: tvalentyn.
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