Default format for date on mapping property do not match default format used to save when calling save all

[ederfmartins]

elasticsearch version: 2.1
python version: 2.7
elasticsearch python version: 2.1.0

In esengine/fields.py: Default format for date on mapping property do not match default format used to save when calling save_all (that uses value.isoformat() internally).

from esengine.fields import DateField
from esengine import Document
from elasticsearch import Elasticsearch


class MyDoc(Document):
   _doctype = 'mydoctype'
   _index = 'myindex'
   _es = Elasticsearch()
   mydate = DateField()

MyDoc.put_mapping()

try:
   MyDoc(mydate='2015-10-01').save()
except Exception as e:
   print e

try:
   MyDoc.save_all([MyDoc(mydate='2015-10-01')])
except Exception as e:
   print e

traceback

Traceback (most recent call last):
 File "t.py", line 13, in <module>
   MyDoc.save_all([MyDoc(mydate='2015-10-01')])
 File "/usr/local/lib/python2.7/dist-packages/esengine/document.py", line 384, in save_all
   eh.bulk(cls.get_es(es), actions, **kwargs)
 File "/usr/local/lib/python2.7/dist-packages/elasticsearch/helpers/__init__.py", line 188, in bulk
   for ok, item in streaming_bulk(client, actions, **kwargs):
 File "/usr/local/lib/python2.7/dist-packages/elasticsearch/helpers/__init__.py", line 160, in streaming_bulk
   for result in _process_bulk_chunk(client, bulk_actions, raise_on_exception, raise_on_error, **kwargs):
 File "/usr/local/lib/python2.7/dist-packages/elasticsearch/helpers/__init__.py", line 132, in _process_bulk_chunk
   raise BulkIndexError('%i document(s) failed to index.' % len(errors), errors)
elasticsearch.helpers.BulkIndexError: (u'1 document(s) failed to index.', [{u'create': {u'status': 400, u'_type': u'mydoctype', u'_id': u'AVIcSiT2s5zkWhhVSfUA', u'error': {u'caused_by': {u'reason': u'Invalid format: "2015-10-01T00:00:00" is malformed at "T00:00:00"', u'type': u'illegal_argument_exception'}, u'reason': u'failed to parse [mydate]', u'type': u'mapper_parsing_exception'}, u'_index': u'myindex'}}])

probably removing "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd" solves the problem

class DateField(BaseField):
...
    _default_mapping = {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd"
    }
...
    def to_dict(self, value, validate=True):
        if validate:
            self.validate(value)
        if value:
            if self._date_format:
                return value.strftime(self._date_format)
            else:
                return value.isoformat()

[rochacbruno]

"format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd" removed, but still needs to write a test to run on Travis.

if os.environ.get('TRAVIS'):
    assert.....