diff --git a/src/main/java/org/elasticsearch/index/search/child/ChildrenConstantScoreQuery.java b/src/main/java/org/elasticsearch/index/search/child/ChildrenConstantScoreQuery.java
index 82c2940a507..700f0fb6f9e 100644
--- a/src/main/java/org/elasticsearch/index/search/child/ChildrenConstantScoreQuery.java
+++ b/src/main/java/org/elasticsearch/index/search/child/ChildrenConstantScoreQuery.java
@@ -95,6 +95,7 @@ public class ChildrenConstantScoreQuery extends Query {
             childQuery = rewrittenChildQuery;
         }
         IndexSearcher indexSearcher = new IndexSearcher(searcher.getIndexReader());
+        indexSearcher.setSimilarity(searcher.getSimilarity());
         indexSearcher.search(childQuery, collector);
 
         int remaining = collectedUids.v().size();
diff --git a/src/main/java/org/elasticsearch/index/search/child/ChildrenQuery.java b/src/main/java/org/elasticsearch/index/search/child/ChildrenQuery.java
index 029ed239f69..98533a461f2 100644
--- a/src/main/java/org/elasticsearch/index/search/child/ChildrenQuery.java
+++ b/src/main/java/org/elasticsearch/index/search/child/ChildrenQuery.java
@@ -157,6 +157,7 @@ public class ChildrenQuery extends Query {
             childQuery = rewrittenChildQuery;
         }
         IndexSearcher indexSearcher = new IndexSearcher(searcher.getIndexReader());
+        indexSearcher.setSimilarity(searcher.getSimilarity());
         indexSearcher.search(childQuery, collector);
 
         int size = uidToScore.v().size();
diff --git a/src/main/java/org/elasticsearch/index/search/child/DeleteByQueryWrappingFilter.java b/src/main/java/org/elasticsearch/index/search/child/DeleteByQueryWrappingFilter.java
index 2fd96107621..0ead91e96de 100644
--- a/src/main/java/org/elasticsearch/index/search/child/DeleteByQueryWrappingFilter.java
+++ b/src/main/java/org/elasticsearch/index/search/child/DeleteByQueryWrappingFilter.java
@@ -22,6 +22,7 @@ import org.apache.lucene.index.AtomicReaderContext;
 import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.index.MultiReader;
 import org.apache.lucene.search.*;
+import org.apache.lucene.search.similarities.Similarity;
 import org.apache.lucene.util.Bits;
 import org.elasticsearch.search.internal.SearchContext;
 
@@ -65,7 +66,9 @@ public class DeleteByQueryWrappingFilter extends Filter {
             try {
                 if (!contains(indexReader, context)) {
                     multiReader = new MultiReader(new IndexReader[]{indexReader, context.reader()}, false);
+                    Similarity similarity = searcher.getSimilarity();
                     searcher = new IndexSearcher(new MultiReader(indexReader, context.reader()));
+                    searcher.setSimilarity(similarity);
                 }
                 weight = searcher.createNormalizedWeight(query);
             } finally {
@@ -78,7 +81,9 @@ public class DeleteByQueryWrappingFilter extends Filter {
             if (!contains(indexReader, context)) {
                 IndexReader multiReader = new MultiReader(new IndexReader[]{indexReader, context.reader()}, false);
                 try {
+                    Similarity similarity = searcher.getSimilarity();
                     searcher = new IndexSearcher(multiReader);
+                    searcher.setSimilarity(similarity);
                     weight = searcher.createNormalizedWeight(query);
                 } finally {
                     multiReader.close();
diff --git a/src/main/java/org/elasticsearch/index/search/child/ParentConstantScoreQuery.java b/src/main/java/org/elasticsearch/index/search/child/ParentConstantScoreQuery.java
index 31e25afa734..387a8ea5500 100644
--- a/src/main/java/org/elasticsearch/index/search/child/ParentConstantScoreQuery.java
+++ b/src/main/java/org/elasticsearch/index/search/child/ParentConstantScoreQuery.java
@@ -87,6 +87,7 @@ public class ParentConstantScoreQuery extends Query {
             parentQuery = rewrittenParentQuery = originalParentQuery.rewrite(searcher.getIndexReader());
         }
         IndexSearcher indexSearcher = new IndexSearcher(searcher.getIndexReader());
+        indexSearcher.setSimilarity(searcher.getSimilarity());
         indexSearcher.search(parentQuery, collector);
 
         if (parents.v().isEmpty()) {
diff --git a/src/main/java/org/elasticsearch/index/search/child/ParentQuery.java b/src/main/java/org/elasticsearch/index/search/child/ParentQuery.java
index 3d3ce266c26..599a7ebd8d2 100644
--- a/src/main/java/org/elasticsearch/index/search/child/ParentQuery.java
+++ b/src/main/java/org/elasticsearch/index/search/child/ParentQuery.java
@@ -129,6 +129,7 @@ public class ParentQuery extends Query {
             parentQuery = rewrittenParentQuery;
         }
         IndexSearcher indexSearcher = new IndexSearcher(searcher.getIndexReader());
+        indexSearcher.setSimilarity(searcher.getSimilarity());
         indexSearcher.search(parentQuery, collector);
 
         if (uidToScore.v().isEmpty()) {
diff --git a/src/main/java/org/elasticsearch/index/search/child/TopChildrenQuery.java b/src/main/java/org/elasticsearch/index/search/child/TopChildrenQuery.java
index 3300ea39957..1d686cd828d 100644
--- a/src/main/java/org/elasticsearch/index/search/child/TopChildrenQuery.java
+++ b/src/main/java/org/elasticsearch/index/search/child/TopChildrenQuery.java
@@ -124,6 +124,7 @@ public class TopChildrenQuery extends Query {
         }
 
         IndexSearcher indexSearcher = new IndexSearcher(searcher.getIndexReader());
+        indexSearcher.setSimilarity(searcher.getSimilarity());
         while (true) {
             parentDocs.v().clear();
             TopDocs topChildDocs = indexSearcher.search(childQuery, numChildDocs);