Index hashtags

Summary

We should be indexing hashtags for auto-completion correctly again.

Closes #1122 (closed)

Steps to test

• Log in with your user
• Post something with a unique hashtag (one which does not appear in the autocomplete)
• Wait 5 seconds
• Reload the page
• Start posting something with the unique hashtag you used before, you should see it on the autocomplete box

Estimated Regression Scope

There's no much room for regressions as this is just fixing a permanent false in an if condition while indexing posts.