<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def SetDocumentType(self, document_type):
 """Sets the document type. Args: document_type (str):
 document type. """

    self._document_type = document_type
    logger.debug('Elasticsearch document type: {0:s}'.format(document_type))