kinesis_firehose: compression options documentation

Signed-off-by: Matthew Fala <[email protected]>

Author: matthewfala

pipeline/outputs/firehose.md

@@ -21,6 +21,7 @@ See [here](https://github.com/fluent/fluent-bit-docs/tree/43c4fe134611da471e706b
 | time\_key | Add the timestamp to the record under this key. By default the timestamp from Fluent Bit will not be added to records sent to Kinesis. |
 | time\_key\_format | strftime compliant format string for the timestamp; for example, the default is '%Y-%m-%dT%H:%M:%S'. This option is used with time\_key. |
 | log\_key | By default, the whole log record will be sent to Firehose. If you specify a key name with this option, then only the value of that key will be sent to Firehose. For example, if you are using the Fluentd Docker log driver, you can specify `log_key log` and only the log message will be sent to Firehose. |
+| compression | Compression type for Firehose records. Each log record is individually compressed and sent to Firehose. 'gzip' and 'arrow' are the supported values. 'arrow' is only an available if Apache Arrow was enabled at compile time. Defaults to no compression. |
 | role\_arn | ARN of an IAM role to assume \(for cross account access\). |
 | endpoint | Specify a custom endpoint for the Firehose API. |
 | sts\_endpoint | Custom endpoint for the STS API. |