I can query things directly on the server using curl, and it returns the data with no error. I just can't do it from my forum.
Running Debian Jessie with Elasticsearch installed from the repos, no settings changed except for setting the shards/replicas to 1/0.
Edit: Rather than using the version in the Debian repo I added elastic.co and installed v2, seems to be ok now. Maybe a moderator can remove this topic.