**Found in version**
- Observed in 8.2.3, but might exist longer

**Steps to reproduce**
On a multi node cloud cluster (might also work on a local multi node cluster):
- Create a transform with a retention policy
- Update the transform and remove the retention policy

**Expected result**
- The retention policy is removed

**Actual result**
- This sometimes results in an error:
```
An error occurred calling the API endpoint to update transforms.
Bad Request: [illegal_argument_exception: [illegal_argument_exception] Reason: 
Unknown NamedWriteable [org.elasticsearch.xpack.core.transform.transforms.RetentionPolicyConfig][null_retention_policy]]:
Unknown NamedWriteable [org.elasticsearch.xpack.core.transform.transforms.RetentionPolicyConfig][null_retention_policy]
```

**Additional information**
- Quote from slack discussion with @benwtrent:
  > It wouldn’t happen if you hit a node that can execute the update immediately without serializing to a different node
x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/XPackClientPlugin.java
new ParseField(MlTasks.DATAFEED_TASK_NAME),
                StartDatafeedAction.DatafeedParams::fromXContent
            ),
            new NamedXContentRegistry.Entry(
                PersistentTaskParams.class,
                new ParseField(MlTasks.JOB_TASK_NAME),
                OpenJobAction.JobParams::fromXContent
            ),
            new NamedXContentRegistry.Entry(
                PersistentTaskParams.class,
                new ParseField(MlTasks.DATA_FRAME_ANALYTICS_TASK_NAME),
                StartDataFrameAnalyticsAction.TaskParams::fromXContent
            ),
            new NamedXContentRegistry.Entry(
                PersistentTaskParams.class,
                new ParseField(MlTasks.JOB_SNAPSHOT_UPGRADE_TASK_NAME),
                SnapshotUpgradeTaskParams::fromXContent
            ),
            
            new NamedXContentRegistry.Entry(PersistentTaskState.class, new ParseField(DatafeedState.NAME), DatafeedState::fromXContent),
            new NamedXContentRegistry.Entry(PersistentTaskState.class, new ParseField(JobTaskState.NAME), JobTaskState::fromXContent),
            new NamedXContentRegistry.Entry(
                PersistentTaskState.class,
                new ParseField(DataFrameAnalyticsTaskState.NAME),
                DataFrameAnalyticsTaskState::fromXContent
            ),
            new NamedXContentRegistry.Entry(
                PersistentTaskState.class,
                new ParseField(SnapshotUpgradeTaskState.NAME),
                SnapshotUpgradeTaskState::fromXContent