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**Features and Improvements**
- Allow user to specify the feature types in ``aws_textract_pipeline.api.LandingDocument`` in S3 object metadata.
- Allow user to specify the ``single_api_call`` flag in ``aws_textract_pipeline.api.BaseTracker.component_to_textract_output`` step.
**Bugfixes**
- Fix a bug that ``aws_textract_pipeline.api.BaseTracker.component_to_textract_output`` doesn't work properly when making only one Textract API call.