Example Solr schema.

schema.xml

<schema name="example" version="1.5">
    <fields>   
        <field name="_version_" type="long" indexed="true" stored="true" required="true"/>   
        <field name="auction_id" type="string" indexed="true" stored="true" required="true" multiValued="false" /> 
        <field name="title" type="text_en" indexed="true" stored="true" required="true" multiValued="false" />
        <field name="category" type="string" indexed="true" stored="true" required="true" multiValued="false" />
        <field name="current_bid" type="currency" indexed="true" stored="true" required="true" multiValued="false" />
        <field name="end_date" type="date" indexed="true" stored="true" required="true" multiValued="false" />
        <field name="feature" type="string" indexed="true" stored="true" required="false" multiValued="true" />
    </fields>
    
    <uniqueKey>auction_id</uniqueKey>
     
    <types>
        <fieldType name="string" class="solr.StrField" sortMissingLast="true" />
        <fieldType name="date" class="solr.TrieDateField" precisionStep="0" positionIncrementGap="0"/>
        <fieldType name="long" class="solr.TrieLongField" precisionStep="0" positionIncrementGap="0"/>
        <fieldType name="text_en" class="solr.TextField" positionIncrementGap="100">
            <!-- lots of details -->
        </fieldType> 
        <fieldType name="currency" class="solr.CurrencyField" precisionStep="8" defaultCurrency="USD" currencyConfig="currency.xml" />
    </types>
</schema>