Improve issue search (#2387)

* Improve issue indexer

* Fix new issue sqlite bug

* Different test indexer paths for each db

* Add integration indexer paths to make clean

vendor/github.com/blevesearch/bleve/mapping/mapping.go

@@ -22,12 +22,21 @@ import (
 	"github.com/blevesearch/bleve/document"
 )
 
-// A Classifier is an interface describing any object
-// which knows how to identify its own type.
+// A Classifier is an interface describing any object which knows how to
+// identify its own type.  Alternatively, if a struct already has a Type
+// field or method in conflict, one can use BleveType instead.
 type Classifier interface {
 	Type() string
 }
 
+// A bleveClassifier is an interface describing any object which knows how
+// to identify its own type.  This is introduced as an alternative to the
+// Classifier interface which often has naming conflicts with existing
+// structures.
+type bleveClassifier interface {
+	BleveType() string
+}
+
 var logger = log.New(ioutil.Discard, "bleve mapping ", log.LstdFlags)
 
 // SetLog sets the logger used for logging