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At the moment it is not possible to add OptimizeForTextSearch = true to fields when using modify on a field in a tableextension.
This should be able to be changed by developers.
STATUS DETAILS
Needs Votes

Business Central Team (administrator)
Thank you for this suggestion! Currently this is not on our roadmap. We are tracking this idea and if it gathers more votes and comments we will consider it in the future. Best regards, Business Central Team