do not fail on uknown properties when grouping entities by ID

dhp-workflows/dhp-dedup-openaire/src/main/java/eu/dnetlib/dhp/oa/dedup/GroupEntitiesSparkJob.java

@@ -10,6 +10,7 @@ import java.util.Objects;
 import java.util.Optional;
 import java.util.stream.Collectors;
 
+import com.fasterxml.jackson.databind.DeserializationFeature;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.spark.SparkConf;
@@ -42,9 +43,8 @@ public class GroupEntitiesSparkJob {
 
 	private final static String ID_JPATH = "$.id";
 
-	private final static String SOURCE_JPATH = "$.source";
-
-	private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper();
+	private static ObjectMapper OBJECT_MAPPER = new ObjectMapper()
+			.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
 
 	public static void main(String[] args) throws Exception {