The Pushshift API was down for a bit due to a server issue but is now back up and handling requests. The backlog should be caught up within the next 30 minutes.
Here's a live view of the requests coming in.
One of the nodes did go down. Thanks for the report. Should be working now. There is a query causing issues and I haven't had time to track down which one is hosing up ES. Must be one hell of a query.