GEODE-8704: many CI failures in Jetty9CachingClientServerTest (#5745)

diff --git a/geode-assembly/src/distributedTest/java/org/apache/geode/session/tests/Jetty9CachingClientServerTest.java b/geode-assembly/src/distributedTest/java/org/apache/geode/session/tests/Jetty9CachingClientServerTest.java
index b41cd47..83061e5 100644
--- a/geode-assembly/src/distributedTest/java/org/apache/geode/session/tests/Jetty9CachingClientServerTest.java
+++ b/geode-assembly/src/distributedTest/java/org/apache/geode/session/tests/Jetty9CachingClientServerTest.java
@@ -23,12 +23,14 @@
 
 import javax.servlet.http.HttpSession;
 
+import org.junit.Ignore;
 import org.junit.Test;
 
 import org.apache.geode.cache.Region;
 import org.apache.geode.internal.cache.InternalCache;
 import org.apache.geode.test.dunit.rules.ClusterStartupRule;
 
+@Ignore("GEODE-8704")
 public class Jetty9CachingClientServerTest extends GenericAppServerClientServerTest {
 
   @Override