I think you need to convert them from these characters to the number using solr.MappingCharFilterFactory https://cwiki.apache.org/confluence/display/solr/CharFilterFactories
So basically you can have a file mapping-ArabicNumbersToASCII.txt
and that contains:
"٠" => "0"
"١" => "1"
"٢" => "2"
"٣" => "3"
...
Then use the it as the analyzer like so:
<analyzer>
<charFilter class="solr.MappingCharFilterFactory"
mapping="mapping-ArabicNumbersToASCII.txt"/>
<tokenizer ...>
[...]
</analyzer>