The "Type" filter for my installation of SonarQube 5.6 appears to be non-functional. Note in the first screen-shot that the number of Rules of Type Bug, Vulnerability, or Code Smell is 0 (even though several Rules in the screen shot are of that Type). The second screen shot shows that filtering on one of these Types does indeed lead to an empty set result.
0 Rules of Type Bug, Vulnerability, or Code Smell Empty set results when filtering on Bug
Those search facets are populated from ElasticSearch. The fact that they're screwed up indicates that the ES indices are toast. Try deleting /data/es and restarting.
