I am working on search using examine I set external index as

  <IndexSet SetName="ExternalIndexSet" IndexPath="~/App_Data/TEMP/ExamineIndexes/{machinename}/External/" >
    <IndexAttributeFields>

    </IndexAttributeFields>
    <IndexUserFields>
      <add Name="autoPopulatedTags" />
      <add Name="specificContentTheme" />
      <add Name="type" />
      <add Name="format" />
      <add Name="articleDescription"/>
    </IndexUserFields>
    <IncludeNodeTypes>
      <add Name="pageModuleArticle" />
      <add Name="pageModuleNewsDetail" />
    </IncludeNodeTypes>
  </IndexSet>

and in Examinesetting.config

 <add name="ExternalIndexer" type="UmbracoExamine.UmbracoContentIndexer, UmbracoExamine" />



<add name="ExternalSearcher" type="UmbracoExamine.UmbracoExamineSearcher, UmbracoExamine" />

But when i check Internal and external folder in Examine both have the write.lock file. What I am doing wrong which is responsible for generating of lock file.

Please help on this and please suggest the right way to write external index in examinesetting.config and exmiineindex.config.

Thanks

Manish