Sitecore site search custom index, based off of the default web index.

SiteSearchIndex.Web.config

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
   <sitecore>
      <contentSearch>
         <configuration type="Sitecore.ContentSearch.ContentSearchConfiguration, Sitecore.ContentSearch">
            <indexes hint="list:AddIndex">
               <index id="sitesearch_web_index" type="Sitecore.ContentSearch.LuceneProvider.LuceneIndex, Sitecore.ContentSearch.LuceneProvider">
                  <param desc="name">$(id)</param>
                  <param desc="folder">$(id)</param>
                  <!-- This initializes index property store. Id has to be set to the index id -->
                  <param desc="propertyStore" ref="contentSearch/indexConfigurations/databasePropertyStore" param1="$(id)" />
                  <configuration ref="contentSearch/indexConfigurations/sitesearchWebConfiguration" />
                  <strategies hint="list:AddStrategy">
                     <!-- NOTE: order of these is controls the execution order -->
                     <strategy ref="contentSearch/indexConfigurations/indexUpdateStrategies/onPublishEndAsync" />
                  </strategies>
                  <commitPolicyExecutor type="Sitecore.ContentSearch.CommitPolicyExecutor, Sitecore.ContentSearch">
                     <policies hint="list:AddCommitPolicy">
                        <policy type="Sitecore.ContentSearch.TimeIntervalCommitPolicy, Sitecore.ContentSearch" />
                     </policies>
                  </commitPolicyExecutor>
                  <locations hint="list:AddCrawler">
                     <crawler type="Sitecore.ContentSearch.SitecoreItemCrawler, Sitecore.ContentSearch">
                        <Database>web</Database>
                        <Root>/sitecore</Root>
                     </crawler>
                  </locations>
               </index>
            </indexes>
         </configuration>
      </contentSearch>
   </sitecore>
</configuration>