Numeric time stamp causes time_key parsing to fail

[raoul189]

If time_stamp is declared for a particular field in the JSON, and the field is an integer e.g. {"ts":1435527344}, and the time_format is declared as %s, the burrow plugin passes the values to the fluent parser but the fluent parser fails:

time_key ts
time_format %s

error_class=Fluent::ParserError error="value must be string: 1435527344"

The integer should be processed as a valid strftime epoch time stamp similar to:
% date -u --date=@1435527344
Sun Jun 28 21:35:44 UTC 2015

burrow may need to change the type in case of integer time stamps before submitting.

Thank you!

[artem-kosenko]

+1 the same issue. Json can not be parsed because of this.