Remove 'flaky' tag from elasticsearch tests

Now the elasticsearch implementation is considered stable enough for
experimental usage, and is mentioned as such in the 2.14 release notes,
we should remove the "flaky" tag so that the tests get run on CI.

Change-Id: I225a902b74730afbc763a0989b4ce7d7481fed42

gerrit-elasticsearch/BUILD

@@ -52,10 +52,8 @@ junit_tests(
     name = "elasticsearch_tests",
     size = "large",
     srcs = glob(["src/test/java/**/*Test.java"]),
-    flaky = 1,
     tags = [
         "elastic",
-        "flaky",
     ],
     deps = [
         ":elasticsearch",