Add delta for variance value assertion in SearchIT (#18212)

Signed-off-by: bowenlan-amzn <bowenlan23@gmail.com>

Author: bowenlan-amzn

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

@@ -567,12 +567,12 @@ public void testSearchWithMatrixStats() throws IOException {
         MatrixStats matrixStats = searchResponse.getAggregations().get("agg1");
         assertEquals(5, matrixStats.getFieldCount("num"));
         assertEquals(56d, matrixStats.getMean("num"), 0d);
-        assertEquals(1830.0000000000002, matrixStats.getVariance("num"), 0d);
+        assertEquals(1830.0000000000002, matrixStats.getVariance("num"), 1.0e-12);
         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(330d, matrixStats.getVariance("num2"), 1.0e-12);
         assertEquals(-0.13568039346585542, matrixStats.getSkewness("num2"), 1.0e-16);
         assertEquals(1.3517561983471071, matrixStats.getKurtosis("num2"), 0d);
         assertEquals(-767.5, matrixStats.getCovariance("num", "num2"), 0d);