Dynamic mapping all fields as string

I am using dynamic mapping, to enable partial search I am adding * at end of user entered keyword. the problem is this approach is only searching in string/keyword fields. to overcome this limitation, i want to store every field as string so that wild card search will work. I want to understand if we face any problems in storing everything in string format ..
can I able to filter records based on dates(greater than some date?) if the fields are in string format....
Any alternate solution will also be helpful for me

Usage of wildcards is slow. So unless you are ok with slow response time, I'd encourage you looking at an edge ngram strategy.

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