Increase timeout on testUpdateAnalysisLeaderIndexSettings

Closes #54204

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/IndexFollowingIT.java

@@ -1063,7 +1063,7 @@ public class IndexFollowingIT extends CcrIntegTestCase {
             } catch (Exception e) {
                 throw new AssertionError("error while searching", e);
             }
-        });
+        }, 30, TimeUnit.SECONDS);
         assertThat(hasFollowIndexBeenClosedChecker.getAsBoolean(), is(true));
     }