Don't assume bulks have finished before we call refresh

Author: nicktindall

x-pack/plugin/analytics/src/test/java/org/elasticsearch/xpack/analytics/aggregations/metrics/HistogramPercentileAggregationTests.java

@@ -82,7 +82,7 @@ public void testHDRHistogram() throws Exception {
             bulkRequest.add(new IndexRequest("raw").source(doc));
             histogram.recordValue(value);
             if ((i + 1) % frq == 0) {
-                client().bulk(bulkRequest);
+                client().bulk(bulkRequest).actionGet();
                 bulkRequest = new BulkRequest();
                 List<Double> values = new ArrayList<>();
                 List<Integer> counts = new ArrayList<>();
@@ -186,7 +186,7 @@ private void setupTDigestHistogram(int compression) throws Exception {
             bulkRequest.add(new IndexRequest("raw").source(doc));
             histogram.add(value);
             if ((i + 1) % frq == 0) {
-                client().bulk(bulkRequest);
+                client().bulk(bulkRequest).actionGet();
                 bulkRequest = new BulkRequest();
                 List<Double> values = new ArrayList<>();
                 List<Long> counts = new ArrayList<>();