Exclude versionb from grouping (#441)

Author: khorshuheng

serving/src/main/java/feast/serving/specs/CachedSpecService.java

@@ -49,7 +49,6 @@
 import java.util.concurrent.ExecutionException;
 import java.util.stream.Collectors;
 import org.apache.commons.lang3.tuple.Pair;
-import org.apache.commons.lang3.tuple.Triple;
 import org.slf4j.Logger;
 
 /** In-memory cache of specs. */
@@ -199,8 +198,8 @@ private Map<String, String> getFeatureToFeatureSetMapping(
         .collect(
             groupingBy(
                 featureSet ->
-                    Triple.of(
-                        featureSet.getProject(), featureSet.getName(), featureSet.getVersion())))
+                    Pair.of(
+                        featureSet.getProject(), featureSet.getName())))
         .forEach(
             (group, groupedFeatureSets) -> {
               groupedFeatureSets =