chore: lower log level for harmless "Invalid Json path" warnings (#5163)

Fixed: #5125

Author: vyavdoshenko

src/server/search/doc_accessors.cc

@@ -364,7 +364,10 @@ JsonAccessor::JsonPathContainer* JsonAccessor::GetPath(std::string_view field) c
   }
 
   if (!ptr) {
-    LOG(WARNING) << "Invalid Json path: " << field << ' ' << ec_msg;
+    // This can occur for fields that are not actual JSON paths but are computed aliases
+    // (e.g., 'vector_distance' from a KNN search clause in FT.SEARCH RETURN).
+    // Such fields are valid for return but won't be found as paths in the document.
+    VLOG(1) << "Invalid Json path: " << field << ' ' << ec_msg;
     return nullptr;
   }