Skip non-snapshot builds (elastic#120881)

Author: salvatore-campagna

muted-tests.yml

@@ -208,8 +208,6 @@ tests:
 - class: org.elasticsearch.search.ccs.CrossClusterIT
   method: testCancel
   issue: https://github.com/elastic/elasticsearch/issues/108061
-- class: org.elasticsearch.xpack.logsdb.seqno.RetentionLeaseRestIT
-  issue: https://github.com/elastic/elasticsearch/issues/120434
 - class: org.elasticsearch.reservedstate.service.FileSettingsServiceTests
   method: testInvalidJSON
   issue: https://github.com/elastic/elasticsearch/issues/120482

x-pack/plugin/logsdb/src/javaRestTest/java/org/elasticsearch/xpack/logsdb/seqno/RetentionLeaseRestIT.java

@@ -8,6 +8,7 @@
 package org.elasticsearch.xpack.logsdb.seqno;
 
 import org.apache.http.util.EntityUtils;
+import org.elasticsearch.Build;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.Response;
 import org.elasticsearch.client.ResponseException;
@@ -20,6 +21,7 @@
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.xcontent.json.JsonXContent;
+import org.junit.Before;
 import org.junit.ClassRule;
 
 import java.io.IOException;
@@ -35,6 +37,11 @@ public class RetentionLeaseRestIT extends ESRestTestCase {
     private static final String BULK_INDEX_ENDPOINT = "/%s/_bulk";
     private static final String[] DOCUMENT_NAMES = { "alpha", "beta", "gamma", "delta" };
 
+    @Before
+    public void assumeSnapshotBuild() {
+        assumeTrue("/{index}/seq_no/add_retention_lease endpoint only available in snapshot builds", Build.current().isSnapshot());
+    }
+
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)