- This action enables sending notifications to slack channels/users
- Utilizes the incoming webhook API of slack
- Similar to the `email` and `hipchat` actions, multiple slack accounts can be configured, each with its own URL and message defaults
- Slack actions are associated with an account, or if not, they'll be sent via the default account.
- The message itself is very flexible and enables defining simple messages to one or more users and/or one or more channels. For complex message structures, one can use `attachments` as described by the slack API.
Closeselastic/elasticsearch#491
Original commit: elastic/x-pack-elasticsearch@9ecc69c17c
uboness