sample sitecore lucene index

gistfile1.xml

<configuration xmlns:x="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <databases>
      <database id="web" singleInstance="true" type="Sitecore.Data.Database, Sitecore.Kernel">
        <Engines.HistoryEngine.Storage>
          <obj type="Sitecore.Data.$(database).$(database)HistoryStorage, Sitecore.Kernel">
            <param connectionStringName="$(id)" />
            <EntryLifeTime>30.00:00:00</EntryLifeTime>
          </obj>
        </Engines.HistoryEngine.Storage>
        <Engines.HistoryEngine.SaveDotNetCallStack>false</Engines.HistoryEngine.SaveDotNetCallStack>
      </database>
    </databases>
    <search>
      <configuration>
        <indexes>
          <index id="global" type="Sitecore.Search.Index, Sitecore.Kernel">
            <param desc="name">$(id)</param>
            <param desc="folder">$(id)</param>
            <Analyzer ref="search/analyzer"/>
            <locations hint="list:AddCrawler">
              <master type="Sitecore.Search.Crawlers.DatabaseCrawler, Sitecore.Kernel">
                <Database>master</Database>
                <Root>/sitecore/content/site1/</Root>
                <IndexAllFields>true</IndexAllFields>
              </master>
              <web type="Sitecore.Search.Crawlers.DatabaseCrawler, Sitecore.Kernel">
                <Database>web</Database>
                <Root>/sitecore/content/site1/</Root>
                <IndexAllFields>true</IndexAllFields>
              </web>
            </locations>
          </index>
  	  <index id="site2" type="Sitecore.Search.Index, Sitecore.Kernel">
            <param desc="name">$(id)</param>
            <param desc="folder">$(id)</param>
            <Analyzer ref="search/analyzer"/>
            <locations hint="list:AddCrawler">
              <master type="Sitecore.Search.Crawlers.DatabaseCrawler, Sitecore.Kernel">
                <Database>master</Database>
                <Root>/sitecore/content/site2/</Root>
                <IndexAllFields>true</IndexAllFields>
              </master>
              <web type="Sitecore.Search.Crawlers.DatabaseCrawler, Sitecore.Kernel">
                <Database>web</Database>
                <Root>/sitecore/content/site2/</Root>
                <IndexAllFields>true</IndexAllFields>
              </web>
            </locations>
          </index>
        </indexes>
      </configuration>
    </search>
  </sitecore>
</configuration>