Fuzzy search

Hey there,
I take in to a project into elasticsearch. The task is a webshop. Right now the problem is, that its possible to search for foo 40 Liter but its not possible for search for foo 40L. My next step is, to use logstash to put the input into lowercase, like this:

mutate {
lowercase => {
match => [ "request"]

Or is it better to search for a string + number + a regex that contains all possible units and then the short form for units.
What can you also suggest?


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