Add support for no Destination

[KevSex]

It would be good if there was an option for no destination and only to add the alert to the praeco index.

I'd like to be able to create a rule that would trigger an event to the praeco_elastalert_status index but no other action taken (i.e. no email, slack or http trigger). This will allow for a follow-up rule to look for the 'trigger' event(s) and allow for further correlation between events.

The only option for this that I could see from ElastAlert documentation is to implement the command alert option and just echo to /dev/null Not sure if there is an alternative that can be achieved here without the need for the echo command?

[johnsusek]

There is a "Debug" alert type that just outputs to stdout but doesn't actually send alerts to any service. I can add that as an alert type, it might do what you want

[KevSex]

Ah awesome! I don't know if that still adds the event to the elastalert index though or is it purely just to output to python logger with no event indexed?