You can write your own Filter that checks for umlauts and substitutes them with 'ue' etc. It can be done very easily, just take a look at
GermanStemFilter and
GermanStemmer (method 'substitute') to get an idea.
We're using the Snowball Stemmers for German in a way that we can search for "�ml�ut" or "umlaut" and get the same result.
Ulrich
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