Fix REST client tests

This commit fixes a few issues in the REST client tests that arose from
moving to one shard. Moving to one shard causes a reordering of
calculations which impacts floating-point arithmetic. It can also impact
scoring and thus the ranking of docs.

Author: jasontedor

client/rest-high-level/src/test/java/org/elasticsearch/client/SearchIT.java

@@ -313,13 +313,13 @@ public void testSearchWithMatrixStats() throws IOException {
         assertEquals(5, matrixStats.getFieldCount("num"));
         assertEquals(56d, matrixStats.getMean("num"), 0d);
         assertEquals(1830.0000000000002, matrixStats.getVariance("num"), 0d);
-        assertEquals(0.09340198804973046, matrixStats.getSkewness("num"), 0d);
+        assertEquals(0.09340198804973039, matrixStats.getSkewness("num"), 0d);
         assertEquals(1.2741646510794589, matrixStats.getKurtosis("num"), 0d);
         assertEquals(5, matrixStats.getFieldCount("num2"));
         assertEquals(29d, matrixStats.getMean("num2"), 0d);
         assertEquals(330d, matrixStats.getVariance("num2"), 0d);
         assertEquals(-0.13568039346585542, matrixStats.getSkewness("num2"), 1.0e-16);
-        assertEquals(1.3517561983471074, matrixStats.getKurtosis("num2"), 0d);
+        assertEquals(1.3517561983471071, matrixStats.getKurtosis("num2"), 0d);
         assertEquals(-767.5, matrixStats.getCovariance("num", "num2"), 0d);
         assertEquals(-0.9876336291667923, matrixStats.getCorrelation("num", "num2"), 0d);
     }

client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/SearchDocumentationIT.java

@@ -801,7 +801,7 @@ public void testRankEval() throws Exception {
             assertEquals(1.0 / 3.0, qualityLevel, 0.0);
             List<RatedSearchHit> hitsAndRatings = evalQuality.getHitsAndRatings();
             RatedSearchHit ratedSearchHit = hitsAndRatings.get(0);
-            assertEquals("3", ratedSearchHit.getSearchHit().getId());   // <4>
+            assertEquals("1", ratedSearchHit.getSearchHit().getId());   // <4>
             assertFalse(ratedSearchHit.getRating().isPresent());        // <5>
             MetricDetail metricDetails = evalQuality.getMetricDetails();
             String metricName = metricDetails.getMetricName();