code: public static ExecutionStepContextFetcher fetcher(final String pathFlowSid, 
                                                        final String pathExecutionSid, 
                                                        final String pathStepSid) {
          return new ExecutionStepContextFetcher(pathFlowSid, pathExecutionSid, pathStepSid);
      }
docs: Create a ExecutionStepContextFetcher to execute fetch.
  
  @param pathFlowSid Flow Sid.
  @param pathExecutionSid Execution Sid.
  @param pathStepSid Step Sid.
  @return ExecutionStepContextFetcher capable of executing the fetch