Description

Starting from Sitecore XP 9.1 Update-1, a full rebuild of the sitecore_suggested_test_index search index is triggered once an hour. 

ManagedPoolThread #3 11:02:56 WARN  IndexCustodian. FullRebuild triggered on index sitecore_suggested_test_index.
ManagedPoolThread #9 12:03:00 WARN  IndexCustodian. FullRebuild triggered on index sitecore_suggested_test_index.
ManagedPoolThread #7 13:03:03 WARN  IndexCustodian. FullRebuild triggered on index sitecore_suggested_test_index.

This can lead to the increased resource consumption.

Solution

To resolve the issue, consider one of the following options:

• To revert the task settings to run it once every 24 hours, as it was implemented in the previous Sitecore XP versions, do the following:
  
  1. Use the Content Editor to open the /sitecore/system/Tasks/Schedules/Content Testing/Rebuild Suggested Tests Index item in the Master database.
  2. Modify the value of the Schedule field as follows:
     Replace

     20140101|99990101|127|1:00:00

     with

     20140101|99990101|127|1.00:00

• To disable the task (if you do not use the Content Testing Suggested Tests):
  
  1. Open the /sitecore/system/Tasks/Schedules/Content Testing/Rebuild Suggested Tests Index item in the Master database in the Content Editor.
  2. Replace the value of the Schedule field:
     

     20140101|99990101|127|1:00:00

     with

     20140101|99990101|127|0.00:00

  Note: When using the Content Testing Suggested Tests, the data is retrieved from the suggested_test_index, which is rebuilt every hour by the previously mentioned scheduled operation. The index is populated based on the items in the Master database and reporting data is collected for these items. Disabling the scheduled operation stops the index getting new records. Therefore, the report, which is required for Content Testing automatic suggestions, will not be updated, while the rest of the Content Testing functionality will work.

Notes

Starting from Sitecore XP 10.2.0, the task time interval has changed, and a full rebuild of the sitecore_suggested_test_index is triggered every 8 hours by default. The Schedule field of the /sitecore/system/Tasks/Schedules/Content Testing/Rebuild Suggested Tests Index item has the following value:

20140101|99990101|127|08:00:00

For more information about the increased resource consumption, check the Increased number of requests to Azure Search Service article.