Search by text functionality not working for attachments in Enterprise Contracts

Summary:

No result comes up when we search a particular keyword to search for attachments in Enterprise Contracts.

Content (required):

I have already configured the Attachment search functionality using this document and ran the scheduled processes: https://docs.oracle.com/en/cloud/saas/sales/oacts/Chunk799897513.html#s20076615

For searching attachments, I have used the Field search keyword as per this document: https://docs.oracle.com/en/cloud/saas/sales/fasca/contracts-search-options.html#s20032260

For Eg.: _fndAttachments.Title: Deviation

Also, I have attachments with this above title in few contracts, still the result doesn't comes up.

Version (include the version you are using, if applicable):