Update bleve dependency to latest master revision (#6100)

* update bleve to master b17287a86f6cac923a5d886e10618df994eeb54b6724eac2e3b8dde89cfbe3a2

* remove unused pkg from dep file

* change bleve from master to recent revision

vendor/github.com/couchbase/vellum/decoder_v1.go

@@ -29,8 +29,6 @@ func init() {
 
 type decoderV1 struct {
 	data []byte
-	root uint64
-	len  uint64
 }
 
 func newDecoderV1(data []byte) *decoderV1 {
@@ -219,7 +217,7 @@ func (f *fstStateV1) Final() bool {
 }
 
 func (f *fstStateV1) FinalOutput() uint64 {
-	if f.numTrans > 0 && f.final && f.outSize > 0 {
+	if f.final && f.outSize > 0 {
 		return readPackedUint(f.data[f.outFinal : f.outFinal+f.outSize])
 	}
 	return 0