1 files changed, 2 insertions, 1 deletions
diff --git a/core/src/main/java/org/elasticsearch/search/aggregations/bucket/sampler/SamplerAggregator.java b/core/src/main/java/org/elasticsearch/search/aggregations/bucket/sampler/SamplerAggregator.java
index 0592ccf7cf..7be81c0812 100644
--- a/core/src/main/java/org/elasticsearch/search/aggregations/bucket/sampler/SamplerAggregator.java
+++ b/core/src/main/java/org/elasticsearch/search/aggregations/bucket/sampler/SamplerAggregator.java
@@ -33,6 +33,7 @@ import org.elasticsearch.search.aggregations.support.ValuesSource;
 import org.elasticsearch.search.internal.SearchContext;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
@@ -114,7 +115,7 @@ public class SamplerAggregator extends SingleBucketAggregator {
                     return mode;
                 }
             }
-            throw new IllegalArgumentException("Unknown `execution_hint`: [" + value + "], expected any of " + values());
+            throw new IllegalArgumentException("Unknown `execution_hint`: [" + value + "], expected any of " + Arrays.toString(values()));
         }
 
         private final ParseField parseField;