Tests: Disable the query cache for parent/child unit tests.

src/test/java/org/elasticsearch/index/search/child/AbstractChildTests.java

@@ -19,7 +19,13 @@
 
 package org.elasticsearch.index.search.child;
 
-import org.apache.lucene.search.*;
+import org.apache.lucene.search.DocIdSetIterator;
+import org.apache.lucene.search.Filter;
+import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.QueryCache;
+import org.apache.lucene.search.ScoreDoc;
+import org.apache.lucene.search.TopDocs;
 import org.apache.lucene.search.join.BitDocIdSetFilter;
 import org.apache.lucene.util.BitDocIdSet;
 import org.apache.lucene.util.BitSet;
@@ -29,15 +35,17 @@ import org.elasticsearch.common.compress.CompressedString;
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.index.Index;
+import org.elasticsearch.index.IndexService;
 import org.elasticsearch.index.mapper.MapperService;
 import org.elasticsearch.index.mapper.internal.UidFieldMapper;
 import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.index.query.QueryParseContext;
-import org.elasticsearch.index.IndexService;
 import org.elasticsearch.search.internal.SearchContext;
 import org.elasticsearch.test.ElasticsearchSingleNodeLuceneTestCase;
 import org.hamcrest.Description;
 import org.hamcrest.StringDescription;
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Ignore;
 
 import java.io.IOException;
@@ -48,6 +56,19 @@ import static org.hamcrest.Matchers.equalTo;
 @LuceneTestCase.SuppressCodecs(value = {"Lucene40", "Lucene3x"})
 public abstract class AbstractChildTests extends ElasticsearchSingleNodeLuceneTestCase {
 
+    // TODO: Parent/child does not work with the query cache
+    private static final QueryCache DEFAULT_QUERY_CACHE = IndexSearcher.getDefaultQueryCache();
+
+    @Before
+    public void disableQueryCache() {
+        IndexSearcher.setDefaultQueryCache(null);
+    }
+
+    @After
+    public void restoreQueryCache() {
+        IndexSearcher.setDefaultQueryCache(DEFAULT_QUERY_CACHE);
+    }
+
     /**
      * The name of the field within the child type that stores a score to use in test queries.
      * <p />