EPiServer Search - Not starting

Add this to web.config handlers.

 <remove name="svc-Integrated-4.0" />

  <add name="svc-Integrated-4.0" path="*.svc" verb="*" type="System.ServiceModel.Activation.ServiceHttpHandlerFactory, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" preCondition="integratedMode,runtimeVersionv4.0" />

Remove anything that can interfere with 404.<httpErrors errorMode="DetailedLocalOnly" existingResponse="Replace">

      <remove statusCode="404" />

      <error statusCode="404" path="/404" responseMode="ExecuteURL" />

    </httpErrors>

Good guide 

https://world.episerver.com/documentation/developer-guides/CMS/search/full-text-search-legacy/Installing-and-deploying-Search-Service/

https://sveinaandahl.blogspot.com/2013/06/how-to-install-episerver-search-for.html

Good tool

https://gregwiechec.com/2015/09/episerver-search-diagnostic-tool/