搜索结果返回值带@manytomany注解的属性(如：role、tags、users)都为null，代码如下:

package cn._1lift.edianti.domain.information;   import cn._1lift.edianti.domain.AbstractAuditingEntity; import cn._1lift.edianti.domain.Role; import cn._1lift.edianti.domain.User; import cn._1lift.edianti.model.enums.InformationSource; import org.hibernate.annotations.CacheConcurrencyStrategy; import org.springframework.data.elasticsearch.annotations.Document; import org.springframework.data.elasticsearch.annotations.Field; import org.springframework.data.elasticsearch.annotations.FieldType; import org.springframework.data.elasticsearch.annotations.Setting;   import javax.persistence.*; import java.util.Collection; import java.util.HashSet; import java.util.Set;   /**  * Created by Damon on 2016/10/26.  * 咨询信息  */ @Entity @Table(name = "information") @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) @Document(indexName = "information") @Setting(settingPath = "/settings.json") public class Information extends AbstractAuditingEntity{       @Id     @GeneratedValue(strategy = GenerationType.AUTO)     private Long id;       @Column(name = "title")     private String title;       @Column(name = "content",nullable=false,columnDefinition="text")     private String content;       @ManyToOne     @JoinColumn(name="type_id",insertable = false, updatable = false)     private InformationType type;       @Column(name = "type_id")     private Long typeId;       @ManyToMany     @JoinTable(             name = "information_tag",             joinColumns = {@JoinColumn(name = "information_id", referencedColumnName = "id")},             inverseJoinColumns = {@JoinColumn(name = "tag_id", referencedColumnName = "id")}) //    @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)     @Field(type = FieldType.Auto,store = true)     private Set<InformationTag> tags = new HashSet<>();       public void setRoles(Collection<Role> roles) {         this.roles = roles;     }       @ManyToMany     @JoinTable(             name = "information_role",             joinColumns = {@JoinColumn(name = "information_id", referencedColumnName = "id")},             inverseJoinColumns = {@JoinColumn(name = "role_id", referencedColumnName = "id")})     @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)     @Field(type = FieldType.Nested,store = true)     private Collection<Role> roles;       //已读用户列表     @ManyToMany(fetch=FetchType.LAZY)     @JoinTable(             name = "information_Read",             joinColumns = {@JoinColumn(name = "information_id", referencedColumnName = "id")},             inverseJoinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")})     @org.hibernate.annotations.Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)     @Field(type = FieldType.Nested,store = true)     private Set<User> users = new HashSet<>();       /**      * 消息发布来源      */     @Column(name = "source")     private InformationSource source;       public Long getId() {         return id;     }       public void setId(Long id) {         this.id = id;     }       public String getTitle() {         return title;     }       public void setTitle(String title) {         this.title = title;     }       public String getContent() {         return content;     }       public void setContent(String content) {         this.content = content;     }       public InformationType getType() {         return type;     }       public void setType(InformationType type) {         this.type = type;     }       public Set<InformationTag> getTags() {         return tags;     }       public void setTags(Set<InformationTag> tags) {         this.tags = tags;     }       public InformationSource getSource() {         return source;     }       public void setSource(InformationSource source) {         this.source = source;     }       public Long getTypeId() {         return typeId;     }       public void setTypeId(Long typeId) {         this.typeId = typeId;     }       public Collection<Role> getRoles() {         return roles;     }       public void setRoles(Set<Role> roles) {         this.roles = roles;     }       public Set<User> getUsers() {         return users;     }       public void setUsers(Set<User> users) {         this.users = users;     } }