Unable to delete columns (karma integration)

[alseambusher]

With this service integrated to karma, it is not possible to delete columns very fast. After some debugging here is what I found.
There is a bug in semantic_types_column_data_delete function. After catching the exception (by putting a try except around it), this is what I get

For REST call "DELETE /semantic_types/type/<id>

(u'8 document(s) failed to index.',
[
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOiauvlKDucvVASMY6'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOiawTlKDucvVASMY7'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOia-3lKDucvVASMZA'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOia3mlKDucvVASMY8'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOia5tlKDucvVASMY9'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOibAhlKDucvVASMZB'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOia7klKDucvVASMY-'
    }
  },
  {
    u'delete': {
      u'status': 404,
      u'_type': u'files.csv',
      u'_shards': {
        u'successful': 1,
        u'failed': 0,
        u'total': 2
      },
      u'_index': u'index_name',
      u'_version': 9,
      u'found': False,
      u'_id': u'AViOia9PlKDucvVASMY_'
    }
  }
])

If i put a sleep of 0.5 seconds at the end of the function, it works without any hastle. However, this is a bad idea to fix it as it wont work when multiple people are using it.

I guess there is some problem in the way we are doing the bulk delete operation here.