I'm having a requirement where the user can perform search by the content entered in Notes attachment (Data-WorkAttach-Note), but this is not working. Search Indexing is enabled in my application. Index Work Attachments is also checked. I have provided the screenshots of the issue as well as the search settings. 

Can anyone suggest if any configuration is required for this? Or if something is missing. I don't think we need to create a custom declare index table. There should be some OTB way of doing this. 

Thanks in advance!