pack: output: added java_sql_timestamp, a format string used by amazon athena

Signed-off-by: Marcos Diez <[email protected]>

Author: marcosdiez

pipeline/outputs/http.md

@@ -19,7 +19,7 @@ The **http** output plugin allows to flush your records into a HTTP endpoint. Fo
 | header\_tag                | Specify an optional HTTP header field for the original message tag.                                                                                                                                                                                                                                                                |           |
 | header                     | Add a HTTP header key/value pair. Multiple headers can be set.                                                                                                                                                                                                                                                                     |           |
 | json\_date\_key            | Specify the name of the time key in the output record. To disable the time key just set the value to `false`.                                                                                                                                                                                                                      | date      |
-| json\_date\_format         | Specify the format of the date. Supported formats are _double_, _epoch_, _iso8601_ (eg: _2018-05-30T09:39:52.000681Z_) and _java_sql_timestamp_ (eg: _2018-05-30 09:39:52.000681_)                                                                                                                                                                                                          | double    |
+| json\_date\_format         | Specify the format of the date. Supported formats are _double_, _epoch_, _epoch_ms_, _iso8601_ (eg: _2018-05-30T09:39:52.000681Z_) and _java_sql_timestamp_ (eg: _2018-05-30 09:39:52.000681_)                                                                                                                                     | double    |
 | gelf\_timestamp\_key       | Specify the key to use for `timestamp` in _gelf_ format                                                                                                                                                                                                                                                                            |           |
 | gelf\_host\_key            | Specify the key to use for the `host` in _gelf_ format                                                                                                                                                                                                                                                                             |           |
 | gelf\_short\_message\_key  | Specify the key to use as the `short` message in _gelf_ format                                                                                                                                                                                                                                                                     |           |