[TEST] Instead of ignoring the ccr downgrade to basic license qa test

avoid the assertions that check the log files, because that does not work on Windows.
The rest of the test is still useful and should work on Windows CI.

Currently on Windows CI this qa module fails because there is just one test and
that test si ignored if OS is Windows.

Author: martijnvg

x-pack/plugin/ccr/qa/multi-cluster-downgraded-to-basic-license/src/test/java/org/elasticsearch/xpack/ccr/FollowIndexIT.java

@@ -28,7 +28,6 @@
 public class FollowIndexIT extends ESCCRRestTestCase {
 
     public void testDowngradeRemoteClusterToBasic() throws Exception {
-        assumeFalse("windows is the worst", Constants.WINDOWS);
         if ("follow".equals(targetCluster) == false) {
             return;
         }
@@ -78,27 +77,30 @@ public void testDowngradeRemoteClusterToBasic() throws Exception {
             assertThat(indexExists(index2), is(false));
 
             // parse the logs and ensure that the auto-coordinator skipped coordination on the leader cluster
-            assertBusy(() -> {
-                final List<String> lines = Files.readAllLines(PathUtils.get(System.getProperty("log")));
-                final Iterator<String> it = lines.iterator();
-                boolean warn = false;
-                while (it.hasNext()) {
-                    final String line = it.next();
-                    if (line.matches(".*\\[WARN\\s*\\]\\[o\\.e\\.x\\.c\\.a\\.AutoFollowCoordinator\\s*\\] \\[node-0\\] " +
-                        "failure occurred while fetching cluster state for auto follow pattern \\[test_pattern\\]")) {
-                        warn = true;
-                        break;
+            // (does not work on windows...)
+            if (Constants.WINDOWS == false) {
+                assertBusy(() -> {
+                    final List<String> lines = Files.readAllLines(PathUtils.get(System.getProperty("log")));
+                    final Iterator<String> it = lines.iterator();
+                    boolean warn = false;
+                    while (it.hasNext()) {
+                        final String line = it.next();
+                        if (line.matches(".*\\[WARN\\s*\\]\\[o\\.e\\.x\\.c\\.a\\.AutoFollowCoordinator\\s*\\] \\[node-0\\] " +
+                            "failure occurred while fetching cluster state for auto follow pattern \\[test_pattern\\]")) {
+                            warn = true;
+                            break;
+                        }
                     }
-                }
-                assertTrue(warn);
-                assertTrue(it.hasNext());
-                final String lineAfterWarn = it.next();
-                assertThat(
-                    lineAfterWarn,
-                    equalTo("org.elasticsearch.ElasticsearchStatusException: " +
-                        "can not fetch remote cluster state as the remote cluster [leader_cluster] is not licensed for [ccr]; " +
-                        "the license mode [BASIC] on cluster [leader_cluster] does not enable [ccr]"));
-            });
+                    assertTrue(warn);
+                    assertTrue(it.hasNext());
+                    final String lineAfterWarn = it.next();
+                    assertThat(
+                        lineAfterWarn,
+                        equalTo("org.elasticsearch.ElasticsearchStatusException: " +
+                            "can not fetch remote cluster state as the remote cluster [leader_cluster] is not licensed for [ccr]; " +
+                            "the license mode [BASIC] on cluster [leader_cluster] does not enable [ccr]"));
+                });
+            }
         });
 
         // Manually following index2 also does not work after the downgrade: