Fix Path comparisons for Windows tests (elastic#46503)

* Fix Path comparisons for Windows tests

The test NodeEnvironmentTests#testCustonDataPaths worked just fine on
Darwin and Linux, but the comparison was breaking in Windows because one
path had the "C:\" prefix and the other one didn't. The simple fix is to
compare absolute paths rather than potentially relative ones.

server/src/test/java/org/elasticsearch/env/NodeEnvironmentTests.java

@@ -19,7 +19,6 @@
 package org.elasticsearch.env;
 
 import org.apache.lucene.index.SegmentInfos;
-import org.apache.lucene.util.Constants;
 import org.elasticsearch.common.util.set.Sets;
 import org.elasticsearch.core.internal.io.IOUtils;
 import org.apache.lucene.util.LuceneTestCase;
@@ -390,7 +389,6 @@ public void run() {
     }
 
     public void testCustomDataPaths() throws Exception {
-        assumeFalse("Fails on Windows, see https://github.com/elastic/elasticsearch/issues/45333", Constants.WINDOWS);
         String[] dataPaths = tmpPaths();
         NodeEnvironment env = newNodeEnvironment(dataPaths, "/tmp", Settings.EMPTY);
 
@@ -406,7 +404,8 @@ public void testCustomDataPaths() throws Exception {
         assertTrue("settings with path_data should have a custom data path", s2.hasCustomDataPath());
 
         assertThat(env.availableShardPaths(sid), equalTo(env.availableShardPaths(sid)));
-        assertThat(env.resolveCustomLocation(s2, sid), equalTo(PathUtils.get("/tmp/foo/0/" + index.getUUID() + "/0")));
+        assertThat(env.resolveCustomLocation(s2, sid).toAbsolutePath(),
+            equalTo(PathUtils.get("/tmp/foo/0/" + index.getUUID() + "/0").toAbsolutePath()));
 
         assertThat("shard paths with a custom data_path should contain only regular paths",
                 env.availableShardPaths(sid),
@@ -418,7 +417,8 @@ public void testCustomDataPaths() throws Exception {
         IndexSettings s3 = new IndexSettings(s2.getIndexMetaData(), Settings.builder().build());
 
         assertThat(env.availableShardPaths(sid), equalTo(env.availableShardPaths(sid)));
-        assertThat(env.resolveCustomLocation(s3, sid), equalTo(PathUtils.get("/tmp/foo/0/" + index.getUUID() + "/0")));
+        assertThat(env.resolveCustomLocation(s3, sid).toAbsolutePath(),
+            equalTo(PathUtils.get("/tmp/foo/0/" + index.getUUID() + "/0").toAbsolutePath()));
 
         assertThat("shard paths with a custom data_path should contain only regular paths",
                 env.availableShardPaths(sid),