Added support for searchSimilar in ElasticsearchRepository

https://github.com/BioMedCentralLtd/spring-data-elasticsearch/issues/4

src/main/java/org/springframework/data/elasticsearch/core/query/AbstractQuery.java

@@ -33,8 +33,6 @@ import static org.apache.commons.collections.CollectionUtils.addAll;
  */
 abstract class AbstractQuery implements Query{
 
-    private static final Pageable DEFAULT_PAGE = new PageRequest(0, DEFAULT_PAGE_SIZE);
-
     protected Pageable pageable = DEFAULT_PAGE;
     protected Sort sort;
     protected List<String> indices = new ArrayList<String>();

src/main/java/org/springframework/data/elasticsearch/core/query/MoreLikeThisQuery.java

@@ -16,14 +16,13 @@
 
 package org.springframework.data.elasticsearch.core.query;
 
-import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 
 import java.util.ArrayList;
 import java.util.List;
 
 import static org.apache.commons.collections.CollectionUtils.addAll;
-import static org.springframework.data.elasticsearch.core.query.Query.DEFAULT_PAGE_SIZE;
+import static org.springframework.data.elasticsearch.core.query.Query.DEFAULT_PAGE;
 
 /**
  * MoreLikeThisQuery
@@ -50,7 +49,7 @@ public class MoreLikeThisQuery {
     private Integer minWordLen;
     private Integer maxWordLen;
     private Float boostTerms;
-    private Pageable pageable = new PageRequest(0, DEFAULT_PAGE_SIZE);
+    private Pageable pageable = DEFAULT_PAGE;
 
     public String getId() {
         return id;

src/main/java/org/springframework/data/elasticsearch/core/query/Query.java

@@ -17,6 +17,7 @@
 package org.springframework.data.elasticsearch.core.query;
 
 
+import org.springframework.data.domain.PageRequest;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.domain.Sort;
 
@@ -29,7 +30,8 @@ import java.util.List;
  */
 public interface Query {
 
-    int DEFAULT_PAGE_SIZE = 10;
+    public static final int DEFAULT_PAGE_SIZE = 10;
+    public static final Pageable DEFAULT_PAGE = new PageRequest(0, DEFAULT_PAGE_SIZE);
 
 
     /**

src/main/java/org/springframework/data/elasticsearch/repository/ElasticsearchRepository.java

@@ -42,4 +42,6 @@ public interface ElasticsearchRepository<T, ID extends Serializable> extends Ela
     Page<T> search(SearchQuery searchQuery);
 
     Page<T> searchSimilar(T entity);
+
+    Page<T> searchSimilar(T entity, Pageable pageable);
 }

src/main/java/org/springframework/data/elasticsearch/repository/support/SimpleElasticsearchRepository.java

@@ -32,6 +32,7 @@ import java.util.List;
 
 import static org.elasticsearch.index.query.QueryBuilders.inQuery;
 import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
+import static org.springframework.data.elasticsearch.core.query.Query.DEFAULT_PAGE;
 
 /**
  * Elasticsearch specific repository implementation. Likely to be used as target within {@link ElasticsearchRepositoryFactory}
@@ -185,12 +186,20 @@ public class SimpleElasticsearchRepository<T> implements ElasticsearchRepository
 
     @Override
     public Page<T> searchSimilar(T entity) {
+        return searchSimilar(entity, DEFAULT_PAGE);
+    }
+
+    @Override
+    public Page<T> searchSimilar(T entity, Pageable pageable) {
         Assert.notNull(entity, "Cannot search similar records for 'null'.");
+        Assert.notNull(entity, "Pageable cannot be 'null'");
         MoreLikeThisQuery query = new MoreLikeThisQuery();
         query.setId(extractIdFromBean(entity));
+        query.setPageable(pageable);
         return elasticsearchOperations.moreLikeThis(query, getEntityClass());
     }
 
+
     @Override
     public void delete(String id) {
         Assert.notNull(id, "Cannot delete entity with id 'null'.");