outputKey 
  Use in combination with OutputBucketName to specify the output location of your transcript and, optionally, a unique name for your output file. The default name for your transcription output is the same as the name you specified for your transcription job (TranscriptionJobName).
Here are some examples of how you can use OutputKey:
- If you specify 'DOC-EXAMPLE-BUCKET' as the - OutputBucketNameand 'my-transcript.json' as the- OutputKey, your transcription output path is- s3://DOC-EXAMPLE-BUCKET/my-transcript.json.
- If you specify 'my-first-transcription' as the - TranscriptionJobName, 'DOC-EXAMPLE-BUCKET' as the- OutputBucketName, and 'my-transcript' as the- OutputKey, your transcription output path is- s3://DOC-EXAMPLE-BUCKET/my-transcript/my-first-transcription.json.
- If you specify 'DOC-EXAMPLE-BUCKET' as the - OutputBucketNameand 'test-files/my-transcript.json' as the- OutputKey, your transcription output path is- s3://DOC-EXAMPLE-BUCKET/test-files/my-transcript.json.
- If you specify 'my-first-transcription' as the - TranscriptionJobName, 'DOC-EXAMPLE-BUCKET' as the- OutputBucketName, and 'test-files/my-transcript' as the- OutputKey, your transcription output path is- s3://DOC-EXAMPLE-BUCKET/test-files/my-transcript/my-first-transcription.json.
If you specify the name of an Amazon S3 bucket sub-folder that doesn't exist, one is created for you.