DOCSP-43808 document non idempotent inserts (#173)

* DOCSP-43808-Document-non-idempotent-inserts

* Rewording.

* Editorial.

* Removing unnecessary word.

* Responding to internal feedback.

Author: mmaville-mdb

source/jobs/sync-jobs.txt

@@ -40,6 +40,20 @@ Recoverability
 
 .. include:: /includes/fact-cdc-recoverable.rst
 
+Behavior
+--------
+
+Sync jobs are non-idempotent by default. Relational Migrator inserts new 
+documents and embeded arrays each time a job is run, with the option to 
+delete each existing collection at the start of the sync dialogue. You 
+can enable idempotency to delete inserts from the previous sync job 
+automatically.
+
+To enable idempotent inserts for documents and embedded arrays, set 
+``migrator.engine.transform.idempotency: true`` in the 
+``user.properties`` file. Enabling idempotency may have substantial 
+performance impact on large jobs.
+
 Get Started
 -----------
 
@@ -67,4 +81,4 @@ You can perform the following tasks from the **Data Migration** tab.
    Stop </jobs/stopping-jobs>
    Recover </jobs/recover-jobs>
    Pause & Resume with Kafka </jobs/pause-resume-kafka-jobs>
-   Data Verification </jobs/data-verification/data-verification>
+   Data Verification </jobs/data-verification/data-verification>