Config for fields

Feature.BlogPostSearch.IndexConfiguration.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration
    xmlns:patch="http://www.sitecore.net/xmlconfig/"
    xmlns:role="http://www.sitecore.net/xmlconfig/role/"
    xmlns:search="http://www.sitecore.net/xmlconfig/search/">
  <sitecore role:require="Standalone or ContentManagement or ContentDelivery" search:require="solr">
    <contentSearch>
      <indexConfigurations>
        <blogPostSearchIndexConfiguration ref="contentSearch/indexConfigurations/defaultSolrIndexConfiguration">
          <fieldMap ref="contentSearch/indexConfigurations/defaultSolrIndexConfiguration/fieldMap">
            <fieldNames hint="raw:AddFieldByFieldName">
              <field fieldName="title"                                returnType="string" />
              <field fieldName="description"                    returnType="text" />
            </fieldNames>
          </fieldMap>
          <documentOptions type="Sitecore.ContentSearch.SolrProvider.SolrDocumentBuilderOptions, Sitecore.ContentSearch.SolrProvider">
            <indexAllFields>false</indexAllFields>
            <include hint="list:AddIncludedField">
              <!-- Title -->
              <fieldId>{2F16AB86-B0FA-4393-BA95-54521442E9C1}</fieldId>
              <!-- Description -->
              <fieldId>{6578FFCE-5942-47CB-A856-A66944CA0280}</fieldId>
            </include>
          </documentOptions>
          <fieldReaders ref="contentSearch/indexConfigurations/defaultSolrIndexConfiguration/fieldReaders" />
          <indexFieldStorageValueFormatter ref="contentSearch/indexConfigurations/defaultSolrIndexConfiguration/indexFieldStorageValueFormatter" />
          <indexDocumentPropertyMapper ref="contentSearch/indexConfigurations/defaultSolrIndexConfiguration/indexDocumentPropertyMapper" />
          <documentBuilderType ref="contentSearch/indexConfigurations/defaultSolrIndexConfiguration/documentBuilderType" />
        </blogPostSearchIndexConfiguration>
      </indexConfigurations>
    </contentSearch>
  </sitecore>
</configuration>