diff --git a/client/rest-high-level/src/test/java/org/elasticsearch/client/SearchIT.java b/client/rest-high-level/src/test/java/org/elasticsearch/client/SearchIT.java
index 9c9c5425f0006..53a29060f75f1 100644
--- a/client/rest-high-level/src/test/java/org/elasticsearch/client/SearchIT.java
+++ b/client/rest-high-level/src/test/java/org/elasticsearch/client/SearchIT.java
@@ -44,6 +44,7 @@
 import org.elasticsearch.index.query.MatchQueryBuilder;
 import org.elasticsearch.index.query.QueryBuilders;
 import org.elasticsearch.index.query.ScriptQueryBuilder;
+import org.elasticsearch.index.query.TermQueryBuilder;
 import org.elasticsearch.index.query.TermsQueryBuilder;
 import org.elasticsearch.join.aggregations.Children;
 import org.elasticsearch.join.aggregations.ChildrenAggregationBuilder;
@@ -59,6 +60,9 @@
 import org.elasticsearch.search.aggregations.BucketOrder;
 import org.elasticsearch.search.aggregations.bucket.range.Range;
 import org.elasticsearch.search.aggregations.bucket.range.RangeAggregationBuilder;
+import org.elasticsearch.search.aggregations.bucket.significant.SignificantTerms;
+import org.elasticsearch.search.aggregations.bucket.significant.SignificantTermsAggregationBuilder;
+import org.elasticsearch.search.aggregations.bucket.significant.heuristics.PercentageScore;
 import org.elasticsearch.search.aggregations.bucket.terms.Terms;
 import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
 import org.elasticsearch.search.aggregations.matrix.stats.MatrixStats;
@@ -267,6 +271,33 @@ public void testSearchWithTermsAgg() throws IOException {
         assertEquals(2, type2.getDocCount());
         assertEquals(0, type2.getAggregations().asList().size());
     }
+    
+    public void testSearchWithSignificantTermsAgg() throws IOException {
+        SearchRequest searchRequest = new SearchRequest();
+        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
+        searchSourceBuilder.query(new MatchQueryBuilder("num","50"));
+        searchSourceBuilder.aggregation(new SignificantTermsAggregationBuilder("agg1", ValueType.STRING)
+                .field("type.keyword")
+                .minDocCount(1)
+                .significanceHeuristic(new PercentageScore()));
+        searchSourceBuilder.size(0);
+        searchRequest.source(searchSourceBuilder);
+        SearchResponse searchResponse = execute(searchRequest, highLevelClient()::search, highLevelClient()::searchAsync);
+        assertSearchHeader(searchResponse);
+        assertNull(searchResponse.getSuggest());
+        assertEquals(Collections.emptyMap(), searchResponse.getProfileResults());
+        assertEquals(0, searchResponse.getHits().getHits().length);
+        assertEquals(0f, searchResponse.getHits().getMaxScore(), 0f);
+        SignificantTerms significantTermsAgg = searchResponse.getAggregations().get("agg1");
+        assertEquals("agg1", significantTermsAgg.getName());
+        assertEquals(1, significantTermsAgg.getBuckets().size());
+        SignificantTerms.Bucket type1 = significantTermsAgg.getBucketByKey("type1");
+        assertEquals(1, type1.getDocCount());
+        assertEquals(1, type1.getSubsetDf());
+        assertEquals(1, type1.getSubsetSize());
+        assertEquals(3, type1.getSupersetDf());
+        assertEquals(1d/3d, type1.getSignificanceScore(), 0d);
+    }    
 
     public void testSearchWithRangeAgg() throws IOException {
         {
diff --git a/server/src/main/java/org/elasticsearch/search/aggregations/bucket/significant/ParsedSignificantTerms.java b/server/src/main/java/org/elasticsearch/search/aggregations/bucket/significant/ParsedSignificantTerms.java
index 1b4739c184d5e..26c4ec420d080 100644
--- a/server/src/main/java/org/elasticsearch/search/aggregations/bucket/significant/ParsedSignificantTerms.java
+++ b/server/src/main/java/org/elasticsearch/search/aggregations/bucket/significant/ParsedSignificantTerms.java
@@ -175,7 +175,7 @@ static <B extends ParsedBucket> B parseSignificantTermsBucketXContent(final XCon
                         bucket.subsetDf = value;
                         bucket.setDocCount(value);
                     } else if (InternalSignificantTerms.SCORE.equals(currentFieldName)) {
-                        bucket.score = parser.longValue();
+                        bucket.score = parser.doubleValue();
                     } else if (InternalSignificantTerms.BG_COUNT.equals(currentFieldName)) {
                         bucket.supersetDf = parser.longValue();
                     }