code: @Override
      public StartEntitiesDetectionJobResult startEntitiesDetectionJob(StartEntitiesDetectionJobRequest request) {
          request = beforeClientExecution(request);
          return executeStartEntitiesDetectionJob(request);
      }
docs: <p>
  Starts an asynchronous entity detection job for a collection of documents. Use the operation to track the status
  of a job.
  </p>
  <p>
  This API can be used for either standard entity detection or custom entity recognition. In order to be used for
  custom entity recognition, the optional <code>EntityRecognizerArn</code> must be used in order to provide access
  to the recognizer being used to detect the custom entity.
  </p>
  
  @param startEntitiesDetectionJobRequest
  @return Result of the StartEntitiesDetectionJob operation returned by the service.
  @throws InvalidRequestException
  The request is invalid.
  @throws TooManyRequestsException
  The number of requests exceeds the limit. Resubmit your request later.
  @throws ResourceNotFoundException
  The specified resource ARN was not found. Check the ARN and try your request again.
  @throws ResourceUnavailableException
  The specified resource is not available. Check to see if the resource is in the <code>TRAINED</code>
  state and try your request again.
  @throws KmsKeyValidationException
  The KMS customer managed key (CMK) entered cannot be validated. Verify the key and re-enter it.
  @throws InternalServerException
  An internal server error occurred. Retry your request.
  @sample AmazonComprehend.StartEntitiesDetectionJob
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/comprehend-2017-11-27/StartEntitiesDetectionJob"
  target="_top">AWS API Documentation</a>