ERROR LogErrorHandler.handleException(83) | HSEARCH000058: HSEARCH000116: Unexpected error during MassIndexer operation
org.hibernate.search.bridge.BridgeException: Exception while calling bridge#set
        class: nl.project.model.Post
        path: likes.like.user.
  at org.hibernate.search.bridge.util.impl.ContextualExceptionBridgeHelper.buildBridgeException(ContextualExceptionBridgeHelper.java:97)
        at org.hibernate.search.bridge.util.impl.ContextualExceptionBridgeHelper$OneWayConversionContextImpl.set(ContextualExceptionBridgeHelper.java:126)
        at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.buildDocumentFields(DocumentBuilderIndexedEntity.java:501)
        at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.buildDocumentFields(DocumentBuilderIndexedEntity.java:581)
        at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.getDocument(DocumentBuilderIndexedEntity.java:479)
        at org.hibernate.search.engine.spi.DocumentBuilderIndexedEntity.createAddWork(DocumentBuilderIndexedEntity.java:402)
        at org.hibernate.search.batchindexing.impl.EntityConsumerLuceneWorkProducer.index(EntityConsumerLuceneWorkProducer.java:172)
        at org.hibernate.search.batchindexing.impl.EntityConsumerLuceneWorkProducer.indexAllQueue(EntityConsumerLuceneWorkProducer.java:132)
        at org.hibernate.search.batchindexing.impl.EntityConsumerLuceneWorkProducer.run(EntityConsumerLuceneWorkProducer.java:102)
        at org.hibernate.search.batchindexing.impl.OptionallyWrapInJTATransaction.run(OptionallyWrapInJTATransaction.java:112)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: nl.project.model.User.roles, no session or session was closed
        at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:393)
        at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:385)
        at org.hibernate.collection.internal.AbstractPersistentCollection.readElementExistence(AbstractPersistentCollection.java:160)

public class User{

   @ManyToMany(cascade=CascadeType.MERGE,fetch = FetchType.LAZY)
   @JoinTable(name = "ABC", joinColumns = @JoinColumn(nullable = false), inverseJoinColumns = @JoinColumn(nullable = false))
   @Fetch(FetchMode.SUBSELECT)
   @Cache(usage=CacheConcurrencyStrategy.READ_WRITE,region=CacheRegion.USER)
   @IndexedEmbedded(prefix="role.")
   public Set<UserRole> getRoles() {
      return roles;
   }

public class Post{
   @OneToMany(cascade = CascadeType.MERGE, fetch = FetchType.LAZY)
   @JoinTable(name = "XYZ"
      ,joinColumns=@JoinColumn(name="PId")
      ,inverseJoinColumns=@JoinColumn(name="UId")      
      )
   @BatchSize(size=5)
   @IndexedEmbedded(prefix="like.user.",includePaths={"id","nickName"})
   public Set<User> getLikes() {
      return likes;
   }