Logstash is failing to index some events because it can't parse the
timestamp.
{:timestamp=>"2015-11-24T06:45:06.308000+0000", :message=>"Failed parsing date from field",
:field=>"logdate", :value=>"2015-11-24 06:41:40.274488",
:exception=>java.lang.IllegalArgumentException: Invalid format: "2015-11-24 06:41:40.274488",
:level=>:warn}
Add another string match for these more precise timestamps, and also add
ISO8601 as a fallback pattern.
Change-Id: Ic821bbc353be2883099ac84a2f33e363864dcd94
0d576e8191