fix: composite indexes can be corrupted on update

Fixed issue #812

This happened when the key is composite (multiple attributes) and the first key(s) during an update are modified.

Author: lvca

engine/src/main/java/com/arcadedb/database/DocumentIndexer.java

@@ -92,9 +92,9 @@ public void updateDocument(final Document originalRecord, final Document modifie
         oldKeyValues[i] = getPropertyValue(originalRecord, keyNames.get(i));
         newKeyValues[i] = getPropertyValue(modifiedRecord, keyNames.get(i));
 
-        if ((newKeyValues[i] == null && oldKeyValues[i] != null) || (newKeyValues[i] != null && !newKeyValues[i].equals(oldKeyValues[i]))) {
+        if (!keyValuesAreModified &&//
+            ((newKeyValues[i] == null && oldKeyValues[i] != null) || (newKeyValues[i] != null && !newKeyValues[i].equals(oldKeyValues[i])))) {
           keyValuesAreModified = true;
-          break;
         }
       }