To allow boosting content where the search is exactly matched (accent, case, ...) you need to add the following settings to your solr schema.xml
Add a new fieldtyp "rawtext", copy of the "text" fieldtype and remove the filter with are supposed to modify the text :
Example for the french language
<!-- French -->
<fieldType name="text" class="solr.TextField" positionIncrementGap="100">
<analyzer>
<tokenizer class="solr.StandardTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory"/>
<!-- removes l', etc -->
<filter class="solr.ElisionFilterFactory" ignoreCase="true" articles="contractions_fr.txt"/>
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1"
generateNumberParts="1"
catenateWords="0"
catenateNumbers="0"
catenateAll="0"
preserveOriginal="1"
/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_fr.txt" format="snowball" />
<filter class="solr.FrenchLightStemFilterFactory"/>
<!-- less aggressive: <filter class="solr.FrenchMinimalStemFilterFactory"/> -->
<!-- more aggressive: <filter class="solr.SnowballPorterFilterFactory" language="French"/> -->
</analyzer>
</fieldType>
<fieldType name="rawtext" class="solr.TextField" positionIncrementGap="100">
<analyzer>
<tokenizer class="solr.StandardTokenizerFactory"/>
<!-- removes l', etc -->
<filter class="solr.ElisionFilterFactory" ignoreCase="true" articles="contractions_fr.txt"/>
<filter class="solr.WordDelimiterFilterFactory"
generateWordParts="1"
generateNumberParts="1"
catenateWords="0"
catenateNumbers="0"
catenateAll="0"
preserveOriginal="1"
/>
<filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords_fr.txt" format="snowball" />
</analyzer>
</fieldType>
And lastly, add the following dynamic and copy field declaration :
<dynamicField name="*_t_raw" type="rawtext" indexed="true" stored="true" multiValued="true" omitNorms="false"/>
<copyField source="*_t" dest="*_t_raw"/>