diff --git a/.gitignore b/.gitignore
index 4ee86c120..28ec2ec19 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 *.ipr
 *.iml
 *~
+.vscode
 .classpath
 /*/.classpath
 /*/*/.classpath
diff --git a/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/provision/SparkGenerateScholix.java b/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/provision/SparkGenerateScholix.java
index 104cefce2..58a98e490 100644
--- a/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/provision/SparkGenerateScholix.java
+++ b/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/provision/SparkGenerateScholix.java
@@ -1,55 +1,30 @@
 package eu.dnetlib.dhp.provision;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import eu.dnetlib.dhp.application.ArgumentApplicationParser;
 import eu.dnetlib.dhp.provision.scholix.*;
-import eu.dnetlib.dhp.provision.scholix.summary.*;
+import eu.dnetlib.dhp.provision.scholix.summary.ScholixSummary;
 import eu.dnetlib.dhp.schema.oaf.Relation;
 import org.apache.commons.io.IOUtils;
-import org.apache.commons.lang3.StringUtils;
+import org.apache.hadoop.io.compress.GzipCodec;
 import org.apache.spark.SparkConf;
-import org.apache.spark.api.java.JavaPairRDD;
 import org.apache.spark.api.java.JavaSparkContext;
-import org.apache.spark.api.java.function.FlatMapFunction;
 import org.apache.spark.api.java.function.MapFunction;
-import org.apache.spark.api.java.function.PairFlatMapFunction;
-import org.apache.spark.sql.*;
-
-import  static org.apache.spark.sql.functions.col;
-
-import scala.Int;
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Encoders;
+import org.apache.spark.sql.SaveMode;
+import org.apache.spark.sql.SparkSession;
 import scala.Tuple2;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Random;
-
 public class SparkGenerateScholix {
 
 
     public static void main(String[] args) throws Exception {
         final ArgumentApplicationParser parser = new ArgumentApplicationParser(IOUtils.toString(SparkGenerateScholix.class.getResourceAsStream("/eu/dnetlib/dhp/provision/input_generate_summary_parameters.json")));
         parser.parseArgument(args);
-
-
         SparkConf conf = new SparkConf();
         conf.set("spark.sql.shuffle.partitions","4000");
-//        conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer");
-//        conf.registerKryoClasses(new Class[]{
-//                ScholixSummary.class,
-//                CollectedFromType.class,
-//                SchemeValue.class,
-//                TypedIdentifier.class,
-//                Typology.class,
-//                Relation.class,
-//                Scholix.class,
-//                ScholixCollectedFrom.class,
-//                ScholixEntityId.class,
-//                ScholixIdentifier.class,
-//                ScholixRelationship.class,
-//                ScholixResource.class
-//        });
-
-
+        conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer");
         final SparkSession spark = SparkSession
                 .builder()
                 .config(conf)
@@ -57,6 +32,16 @@ public class SparkGenerateScholix {
                 .master(parser.get("master"))
                 .getOrCreate();
 
+        conf.registerKryoClasses(new Class[]{
+                Scholix.class,
+                ScholixCollectedFrom.class,
+                ScholixEntityId.class,
+                ScholixIdentifier.class,
+                ScholixRelationship.class,
+                ScholixResource.class
+        });
+
+
 
         final String graphPath = parser.get("graphPath");
         final String workingDirPath = parser.get("workingDirPath");
@@ -71,12 +56,16 @@ public class SparkGenerateScholix {
                 .map((MapFunction<Tuple2<ScholixSummary, Relation>, Scholix>) f -> Scholix.generateScholixWithSource(f._1(), f._2()), Encoders.bean(Scholix.class));
 
         firstJoin.write().mode(SaveMode.Overwrite).save(workingDirPath+"/scholix_1");
-        firstJoin = spark.read().load(workingDirPath+"/scholix_1").as(Encoders.bean(Scholix.class));
-
-
 
         Dataset<Scholix> scholix_final = spark.read().load(workingDirPath+"/scholix_1").as(Encoders.bean(Scholix.class));
 
+        scholixSummary
+                .map((MapFunction<ScholixSummary, ScholixResource>) ScholixResource::fromSummary, Encoders.bean(ScholixResource.class))
+                .repartition(1000)
+                .write()
+                .mode(SaveMode.Overwrite)
+                .save(workingDirPath+"/scholix_target");
+
         Dataset<ScholixResource> target = spark.read().load(workingDirPath+"/scholix_target").as(Encoders.bean(ScholixResource.class));
 
         scholix_final.joinWith(target, scholix_final.col("identifier").equalTo(target.col("dnetIdentifier")), "inner")
@@ -87,6 +76,9 @@ public class SparkGenerateScholix {
                     scholix.generateIdentifier();
                     scholix.generatelinkPublisher();
                     return scholix;
-                }, Encoders.bean(Scholix.class)).repartition(5000).write().mode(SaveMode.Overwrite).save(workingDirPath+"/scholix_index");
+                }, Encoders.kryo(Scholix.class)).javaRDD().map(s-> {
+            ObjectMapper mapper = new ObjectMapper();
+            return mapper.writeValueAsString(s);
+        }).saveAsTextFile(workingDirPath+"/scholix_json", GzipCodec.class);
     }
 }
diff --git a/dhp-workflows/dhp-graph-provision/src/main/resources/eu/dnetlib/dhp/graph/Application/provision/oozie_app/workflow.xml b/dhp-workflows/dhp-graph-provision/src/main/resources/eu/dnetlib/dhp/graph/Application/provision/oozie_app/workflow.xml
index 1102ec4c1..0c22fbdbf 100644
--- a/dhp-workflows/dhp-graph-provision/src/main/resources/eu/dnetlib/dhp/graph/Application/provision/oozie_app/workflow.xml
+++ b/dhp-workflows/dhp-graph-provision/src/main/resources/eu/dnetlib/dhp/graph/Application/provision/oozie_app/workflow.xml
@@ -33,11 +33,9 @@
             <name>idSummary</name>
             <description>number of cores used by single executor</description>
         </property>
-
-
     </parameters>
 
-    <start to="indexScholix"/>
+    <start to="indexSummary"/>
 
     <kill name="Kill">
         <message>Action failed, error message[${wf:errorMessage(wf:lastErrorNode())}]</message>
@@ -96,12 +94,12 @@
             <name>generate Scholix</name>
             <class>eu.dnetlib.dhp.provision.SparkGenerateScholix</class>
             <jar>dhp-graph-provision-${projectVersion}.jar</jar>
-            <spark-opts>--executor-memory 9G --driver-memory=${sparkDriverMemory} ${sparkExtraOPT}</spark-opts>
+            <spark-opts>--executor-memory 6G --driver-memory=${sparkDriverMemory} ${sparkExtraOPT}</spark-opts>
             <arg>-mt</arg> <arg>yarn-cluster</arg>
             <arg>--workingDirPath</arg><arg>${workingDirPath}</arg>
             <arg>--graphPath</arg><arg>${graphPath}</arg>
         </spark>
-        <ok to="indexScholix"/>
+        <ok to="End"/>
         <error to="Kill"/>
     </action>
 
@@ -111,7 +109,7 @@
             <name-node>${nameNode}</name-node>
             <master>yarn-cluster</master>
             <mode>cluster</mode>
-            <name>generate Summary</name>
+            <name>index Summary</name>
             <class>eu.dnetlib.dhp.provision.SparkIndexCollectionOnES</class>
             <jar>dhp-graph-provision-${projectVersion}.jar</jar>
             <spark-opts>--executor-memory ${sparkExecutorMemory} --driver-memory=${sparkDriverMemory} ${sparkExtraOPT} --conf spark.dynamicAllocation.maxExecutors="64" </spark-opts>
@@ -134,7 +132,7 @@
             <name>index scholix</name>
             <class>eu.dnetlib.dhp.provision.SparkIndexCollectionOnES</class>
             <jar>dhp-graph-provision-${projectVersion}.jar</jar>
-            <spark-opts>--executor-memory ${sparkExecutorMemory}  --driver-memory=${sparkDriverMemory} ${sparkExtraOPT} --conf spark.dynamicAllocation.maxExecutors="16" </spark-opts>
+            <spark-opts>--executor-memory ${sparkExecutorMemory}  --driver-memory=${sparkDriverMemory} ${sparkExtraOPT} --conf spark.dynamicAllocation.maxExecutors="8" </spark-opts>
             <arg>-mt</arg> <arg>yarn-cluster</arg>
             <arg>--sourcePath</arg><arg>${workingDirPath}/scholix_json</arg>
             <arg>--index</arg><arg>${index}_scholix</arg>