Alexander Reelsen b612cab96a Dates: More strict parsing of ISO dates
If you are using the default date or the named identifiers of dates,
the current implementation was allowed to read a year with only one
digit. In order to make this more strict, this fixes a year to be at
least 4 digits. Same applies for month, day, hour, minute, seconds.

Also the new default is `strictDateOptionalTime` for indices created
with Elasticsearch 2.0 or newer.

In addition a couple of not exposed date formats have been exposed, as they
have been mentioned in the documentation.

Closes #6158
2015-07-07 09:34:37 +02:00
..
2015-01-26 09:14:17 -08:00