[ML] Unmuting ForecastIT » testOverflowToDisk for Windows (elastic#114807)

Running the test on Jenkins caused flakiness in Windows. See elastic#44609.

Since we moved to Buildkite I am unmuting this test, assuming that Buildkite is not creating such deep directory structures as Jenkins (see this comment).

We will mute this test again, if this assumption turns out to be wrong.

Closes elastic#44609.

Author: valeriy42

x-pack/plugin/ml/qa/native-multi-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/ml/integration/ForecastIT.java

@@ -6,7 +6,6 @@
  */
 package org.elasticsearch.xpack.ml.integration;
 
-import org.apache.lucene.util.Constants;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ElasticsearchStatusException;
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
@@ -222,8 +221,6 @@ public void testMemoryStatus() {
     }
 
     public void testOverflowToDisk() throws Exception {
-        assumeFalse("https://github.com/elastic/elasticsearch/issues/44609", Constants.WINDOWS);
-
         Detector.Builder detector = new Detector.Builder("mean", "value");
         detector.setByFieldName("clientIP");