Minor updates to speciify grpc v0 api

Author: Tim Middleton

coherence/common.go

@@ -1884,6 +1884,12 @@ func executeEntrySetFilter[K comparable, V any, E any](ctx context.Context, bc *
 	}
 
 	if comparator != nil {
+		if bc.session.GetProtocolVersion() == 0 {
+			// feature not available in V0
+			ch <- &StreamedEntry[K, V]{Err: fmt.Errorf("this feature is not available in this server version")}
+			return ch
+		}
+
 		binComparator, err = serializer.Serialize(comparator)
 		if err != nil {
 			ch <- &StreamedEntry[K, V]{Err: err}

coherence/doc.go

@@ -295,6 +295,8 @@ or [NamedCache] interface, but a function call that takes a [NamedMap] or [Named
 Note: the entries are sorted internally on the gRPC proxy to avoid excessive memory usage, but you need to be careful
 when running this operation against NamedCaches with large number of entries.
 
+Sorting via a [Comparator] is only available when connecting to Coherence server versions CE 25.03+ and commercial 14.1.2.0+.
+
 # Using entry processors for in-place processing
 
 A Processor is an object that allows you to process (update) one or more [NamedMap] entries on the [NamedMap] itself,

coherence/named_map_client.go

@@ -333,6 +333,8 @@ func AddIndexWithComparator[K comparable, V, T, E any](ctx context.Context, nm N
 //
 // Note: the entries are sorted internally on the gRPC proxy to avoid excessive memory usage, but you need to be
 // careful when running this operation against NamedCaches with large number of entries.
+//
+// This feature is only available when connecting to Coherence server versions CE 25.03+ and commercial 14.1.2.0+.
 func EntrySetFilterWithComparator[K comparable, V, E any](ctx context.Context, nm NamedMap[K, V], filter filters.Filter, comparator extractors.Comparator[E]) <-chan *StreamedEntry[K, V] {
 	return executeEntrySetFilter(ctx, nm.getBaseClient(), filter, comparator)
 }

test/e2e/standalone/named_map_test.go

@@ -866,6 +866,11 @@ func RunTestEntrySetFilterWithComparator(t *testing.T, namedMap coherence.NamedM
 		ageResultsDescending = []int{44, 33, 20, 12}
 	)
 
+	if namedMap.GetSession().GetProtocolVersion() == 0 {
+		// skip as not supported in V0
+		return
+	}
+
 	// populate the cache
 	populatePeople(g, namedMap)