Satellite 6.2: EPEL 7 repository sync throws error "PulpError PLP0000: Importer indicated a failed response"

Issue

• The initial metadata task of repository sync for EPEL 7 gets completed but later shows error as

Katello::Errors::PulpError
PLP0000: Importer indicated a failed response

• In task monitor will see the back trace error showing as

traceback: |
    Traceback (most recent call last):
      File "/usr/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task
        R = retval = fun(*args, **kwargs)
      File "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py", line 473, in __call__
        return super(Task, self).__call__(*args, **kwargs)
      File "/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py", line 103, in __call__
        return super(PulpTask, self).__call__(*args, **kwargs)
      File "/usr/lib/python2.7/site-packages/celery/app/trace.py", line 437, in __protected_call__
        return self.run(*args, **kwargs)
      File "/usr/lib/python2.7/site-packages/pulp/server/controllers/repository.py", line 810, in sync
        raise pulp_exceptions.PulpExecutionException(_('Importer indicated a failed response'))
    PulpExecutionException: Importer indicated a failed response
  spawned_tasks: []
  progress_report:
    yum_importer:
      content:
        items_total: 0
        state: FINISHED
        error_details: []
        details:
          rpm_total: 0
          rpm_done: 0
          drpm_total: 0
          drpm_done: 0
        size_total: 0
        size_left: 0
        items_left: 0
      comps:
        state: NOT_STARTED
      purge_duplicates:
        state: NOT_STARTED
      distribution:
        items_total: 0
        state: FINISHED
        error_details: []
        items_left: 0
      errata:
        state: FAILED
        error: command document too large
      metadata:
        state: FINISHED
  queue: reserved_resource_worker-1@xxx
  state: error
  worker_name: reserved_resource_worker-1@xxxx
  result: 
  error:
    code: PLP0000
    data: {}
    description: Importer indicated a failed response