Exclude testOutputTimestamp from flink streaming tests.
diff --git a/runners/flink/job-server/flink_job_server.gradle b/runners/flink/job-server/flink_job_server.gradle
index 27a116f..12b4d65 100644
--- a/runners/flink/job-server/flink_job_server.gradle
+++ b/runners/flink/job-server/flink_job_server.gradle
@@ -151,6 +151,7 @@
       if (streaming) {
         excludeCategories 'org.apache.beam.sdk.testing.UsesTestStreamWithProcessingTime'
         excludeCategories 'org.apache.beam.sdk.testing.UsesTestStreamWithMultipleStages'
+        excludeCategories 'org.apache.beam.sdk.testing.UsesTestStreamWithOutputTimestamp'
       } else {
         excludeCategories 'org.apache.beam.sdk.testing.UsesTestStream'
       }