Siga este código. Em fitAttributeComparator, insira seus valores. insira este fitAttributeSortProvider no solr impex como customSortProvider.
<bean id="fitAttributeSortProvider" class="de.hybris.platform.solrfacetsearch.config.impl.DefaultFacetSortProvider">
<property name="comparator" ref="fitFacetAttributeComparator"/>
</bean>
<bean id="fitFacetAttributeComparator" class="de.hybris.platform.acceleratorservices.search.comparators.FacetValueNameComparator">
<property name="comparator" ref="fitAttributeComparator"/>
</bean>
<bean id="fitAttributeComparator"
class="de.hybris.platform.acceleratorservices.search.comparators.SizeAttributeComparator">
<property name="pattern" value="[0-9]+(\.[0-9])*"/>
<property name="sizeSystems">
<list>
<value>Pequeno</value>
<value>Pequeno_Medio</value>
<value>Medio</value>
<value>Medio_Grande</value>
<value>Grande</value>
</list>
</property>
</bean>