fix go vet issues

http/registry.go

@@ -94,7 +94,7 @@ func UpdateAlias(alias string, add, remove []string) error {
 		// something with this name already exists
 		indexAlias, isAlias := index.(bleve.IndexAlias)
 		if !isAlias {
-			return fmt.Errorf("'%s' is not an alias")
+			return fmt.Errorf("'%s' is not an alias", alias)
 		}
 		// build list of add indexes
 		addIndexes := make([]bleve.Index, len(add))

mapping_index.go

@@ -103,7 +103,7 @@ type IndexMapping struct {
 	DefaultField          string                      `json:"default_field"`
 	ByteArrayConverter    string                      `json:"byte_array_converter"`
 	CustomAnalysis        *customAnalysis             `json:"analysis,omitempty"`
-	cache                 *registry.Cache             `json:"_"`
+	cache                 *registry.Cache
 }
 
 // AddCustomCharFilter defines a custom char fitler for use in this mapping