Fix DataTiersUsageTransportActionTests testCalculateMAD (#64596)

Random the compression factor starting with 1 (to elimitinate nearly 0 values)
which will only use one centroid (and yield 0 for MAD as the aproximate median
is the same as the single centroid mean value)

Author: andreidan

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/DataTiersUsageTransportActionTests.java

@@ -26,10 +26,11 @@
 import static org.mockito.Mockito.when;
 
 public class DataTiersUsageTransportActionTests extends ESTestCase {
+
     public void testCalculateMAD() {
         assertThat(DataTiersUsageTransportAction.computeMedianAbsoluteDeviation(new TDigestState(10)), equalTo(0L));
 
-        TDigestState sketch = new TDigestState(randomDoubleBetween(0, 1000, false));
+        TDigestState sketch = new TDigestState(randomDoubleBetween(1, 1000, false));
         sketch.add(1);
         sketch.add(1);
         sketch.add(2);