SLING-11603 Support cluster deployments

do not process external commits
diff --git a/src/main/java/org/apache/sling/clam/oak/internal/NodeObservingJcrPropertyDigger.java b/src/main/java/org/apache/sling/clam/oak/internal/NodeObservingJcrPropertyDigger.java
index e63bda9..d76295a 100644
--- a/src/main/java/org/apache/sling/clam/oak/internal/NodeObservingJcrPropertyDigger.java
+++ b/src/main/java/org/apache/sling/clam/oak/internal/NodeObservingJcrPropertyDigger.java
@@ -139,7 +139,9 @@
 
     @Override
     protected void added(@NotNull final String path, @NotNull final Set<String> added, @NotNull final Set<String> deleted, @NotNull final Set<String> changed, @NotNull final Map<String, String> properties, @NotNull final CommitInfo commitInfo) {
-        dig(path, concat(added, changed), pattern, propertyType, configuration.property_length_max(), commitInfo.getUserId());
+        if (!commitInfo.isExternal()) {
+            dig(path, concat(added, changed), pattern, propertyType, configuration.property_length_max(), commitInfo.getUserId());
+        }
     }
 
     @Override