diff --git a/src/main/java/org/elasticsearch/index/search/nested/NestedChildrenCollector.java b/src/main/java/org/elasticsearch/index/search/nested/NestedChildrenCollector.java
deleted file mode 100644
index 70da008fbd2..00000000000
--- a/src/main/java/org/elasticsearch/index/search/nested/NestedChildrenCollector.java
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Licensed to ElasticSearch and Shay Banon under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership. ElasticSearch licenses this
- * file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-package org.elasticsearch.index.search.nested;
-
-import org.apache.lucene.index.AtomicReaderContext;
-import org.apache.lucene.search.Collector;
-import org.apache.lucene.search.DocIdSet;
-import org.apache.lucene.search.Filter;
-import org.apache.lucene.search.Scorer;
-import org.apache.lucene.util.Bits;
-import org.apache.lucene.util.FixedBitSet;
-import org.elasticsearch.common.lucene.docset.DocIdSets;
-import org.elasticsearch.common.lucene.search.XCollector;
-
-import java.io.IOException;
-
-/**
- * A collector that accepts parent docs, and calls back the collect on child docs of that parent.
- */
-public class NestedChildrenCollector extends XCollector {
-
-    private final Collector collector;
-    private final Filter parentFilter;
-    private final Filter childFilter;
-    private Bits childDocs;
-    private FixedBitSet parentDocs;
-
-    public NestedChildrenCollector(Collector collector, Filter parentFilter, Filter childFilter) {
-        this.collector = collector;
-        this.parentFilter = parentFilter;
-        this.childFilter = childFilter;
-    }
-
-    @Override
-    public void postCollection() {
-        if (collector instanceof XCollector) {
-            ((XCollector) collector).postCollection();
-        }
-    }
-
-    @Override
-    public void setScorer(Scorer scorer) throws IOException {
-        collector.setScorer(scorer);
-    }
-
-    @Override
-    public void setNextReader(AtomicReaderContext context) throws IOException {
-        collector.setNextReader(context);
-        // Can use null as acceptedDocs here, since only live doc ids are being pushed to collect method.
-        DocIdSet docIdSet = parentFilter.getDocIdSet(context, null);
-        // Im ES if parent is deleted, then also the children are deleted. Therefore acceptedDocs can also null here.
-        childDocs = DocIdSets.toSafeBits(context.reader(), childFilter.getDocIdSet(context, null));
-        if (docIdSet == null) {
-            parentDocs = null;
-        } else {
-            parentDocs = (FixedBitSet) docIdSet;
-        }
-    }
-
-    @Override
-    public boolean acceptsDocsOutOfOrder() {
-        return collector.acceptsDocsOutOfOrder();
-    }
-
-    @Override
-    public void collect(int parentDoc) throws IOException {
-        if (parentDoc == 0 || parentDocs == null) {
-            return;
-        }
-        int prevParentDoc = parentDocs.prevSetBit(parentDoc - 1);
-        for (int i = (parentDoc - 1); i > prevParentDoc; i--) {
-            if (childDocs.get(i)) {
-                collector.collect(i);
-            }
-        }
-    }
-}
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