fix the automatic snapshot queue enable check

The "needs snapshot queue" check was broken, as it only checked inside a loop over indices.
If there are no indexes yet (or more likely if the indices have not yet been loaded off of disk), then this would never use the snapshot queue on roaring.

holder.go

@@ -782,12 +782,8 @@ func (h *Holder) Close() error {
 func (h *Holder) NeedsSnapshot() bool {
 	h.mu.RLock()
 	defer h.mu.RUnlock()
-	for _, idx := range h.Indexes() {
-		if idx.NeedsSnapshot() {
-			return true
-		}
-	}
-	return false
+
+	return h.cfg.Txsrc == "roaring"
 }
 
 // HasData returns true if Holder contains at least one index.

server.go

@@ -88,7 +88,7 @@ type Server struct { // nolint: maligned
 	dataDir       string
 
 	// Threshold for logging long-running queries
-	longQueryTime time.Duration
+	longQueryTime      time.Duration
 	queryHistoryLength int
 }