Solr arabic exact search -

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i new solr , want add new field schema use arabic exact search. have searched lot in stackoverflow not find how it.

here's schema.xml :

field

<field name="arsch" type="string" indexed="true" stored="true"  required="true"/>

type

<fieldtype name="string" class="solr.strfield" sortmissinglast="true" />

i'm getting other words search word. example, if query arsch: "امام" following words: 

"امام"  "الامام" "والامام"  "الاماره"

i want field exact, how it?


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