another foo

Author: Hendrik Muhs

server/src/test/java/org/elasticsearch/search/aggregations/bucket/IpRangeTests.java

@@ -47,7 +47,7 @@ private static String randomIp(boolean v4) {
     @Override
     protected IpRangeAggregationBuilder createTestAggregatorBuilder() {
         int numRanges = randomIntBetween(1, 10);
-        IpRangeAggregationBuilder factory = new IpRangeAggregationBuilder("foo");
+        IpRangeAggregationBuilder factory = new IpRangeAggregationBuilder(randomAlphaOfLengthBetween(3, 10));
         for (int i = 0; i < numRanges; i++) {
             String key = null;
             if (randomBoolean()) {