Fix for EpiServer crash: BuildResult change, cache key=cindexingservice.svc.1f180bcd

a-Instructions.txt

Steps:

1. Delete IndexingService\IndexingService.svc

2. Add the new IndexingService.cs file below to the project

3. Update the service endpoints in web.config as per the Web.config file below

IndexingService.cs

using System;
using System.ServiceModel;
using System.ServiceModel.Activation;

namespace Web.IndexingService
{
    /// <summary>
    /// Replacing the logic found in the IndexingService.svc to try and address a bug at where the run-time compiled assembly has a file-change causing the
    /// App Domain to shutdown/restart. In some cases the shutdown failed, resulting in two AppDomains to be running. More details here:
    /// https://world.episerver.com/forum/developer-forum/Problems-and-bugs/Thread-Container/2019/8/application-restart-loop-because-of-buildresult-change-cache-keycindexingservice-svc-1f180bcd/
    /// </summary>
    public class IndexingServiceHostFactory : WebServiceHostFactory
    {
        protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses)
        {
            var host = base.CreateServiceHost(serviceType, baseAddresses);

            var binding = new WebHttpBinding("IndexingServiceCustomBinding");
            host.AddServiceEndpoint(typeof(EPiServer.Search.IndexingService.IIndexingService), binding, string.Empty);

            return host;
        }
    }
}

Web.config

.... 

<system.serviceModel>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true">
      <serviceActivations>
        <add factory="Web.IndexingService.IndexingServiceHostFactory"
             relativeAddress="IndexingService/IndexingService.svc"
             service="EPiServer.Search.IndexingService.IndexingService" />
      </serviceActivations>
    </serviceHostingEnvironment>
...