Fix and unmute GetSnapshotsIT

Closes: 129740

Author: nicktindall

muted-tests.yml

@@ -574,9 +574,6 @@ tests:
 - class: org.elasticsearch.streams.StreamsYamlTestSuiteIT
   method: test {yaml=streams/logs/10_basic/Check for repeated toggle to same state}
   issue: https://github.com/elastic/elasticsearch/issues/129735
-- class: org.elasticsearch.snapshots.GetSnapshotsIT
-  method: testFilterByState
-  issue: https://github.com/elastic/elasticsearch/issues/129740
 
 # Examples:
 #

server/src/internalClusterTest/java/org/elasticsearch/snapshots/GetSnapshotsIT.java

@@ -655,6 +655,9 @@ public void testFilterByState() throws Exception {
         assertThat(snapshots, hasSize(1));
         assertThat(snapshots.getFirst().state(), is(SnapshotState.SUCCESS));
 
+        // Add some more state (so the next snapshot has some work to do)
+        indexRandomDocs(randomIdentifier(), 100);
+
         // Create a snapshot in progress
         blockAllDataNodes(repoName);
         startFullSnapshot(repoName, "snapshot-in-progress");