The Episerver Find service offers free developer indexes with some limitations, i.e. 25 queries per second and 10000 items. I recently found out what happends if you break the 10k limit and it wasn't sweet. A bricked YSOD:ed development environment.
When setting up Episerver Find developer indexes at http://find.episerver.com you get options similar to this
Noteworthy with this is that each language version is regarded as a unique item in Find, if you have 5000 pages in two different languages they will count as 10000 items.
Hitting the threshold
When hitting that threshold this happends
The actual exception
[WebException: The remote server returned an error: (403) Forbidden.] System.Net.HttpWebRequest.GetResponse() +1749 EPiServer.Find.Connection.JsonRequest.GetResponseStream() +280 EPiServer.Find.Api.Command.GetResponse(IJsonRequest request) +109 [ServiceException: The remote server returned an error: (403) Forbidden. Your account is not authorized to index more than 10000 documents] EPiServer.Find.Api.Command.GetResponse(IJsonRequest request) +679 EPiServer.Find.Api.PutMappingCommand.Execute() +258 EPiServer.Find.ClientConventions.NestedConventions.AddNestedType(Type declaringType, String name) +509 System.Collections.Generic.List`1.ForEach(Action`1 action) +14157259 EPiServer.Find.Commerce.CatalogContentClientConventions.ApplyNestedConventions(NestedConventions nestedConventions) +298 EPiServer.Find.Commerce.CatalogContentClientConventions.ApplyConventions(IClientConventions clientConventions) +81 EPiServer.Framework.Initialization.Internal.ModuleNode.Execute(Action a, String key) +56 EPiServer.Framework.Initialization.Internal.ModuleNode.ConfigureContainer(ServiceConfigurationContext context) +150 EPiServer.Framework.Initialization.InitializationEngine.ConfigureContainer(HostType hostType) +386 EPiServer.Framework.Initialization.InitializationEngine.ExecuteTransition(Boolean continueTransitions) +115 EPiServer.Framework.Initialization.InitializationModule.EngineExecute(HostType hostType, Action`1 engineAction) +293 EPiServer.Framework.Initialization.InitializationModule.FrameworkInitialization(HostType hostType) +230 EPiServer.Global..ctor() +104 Externweb.Web.Global..ctor() in D:\workspace_exerhe\Public Web\Dev-Webshop\Externweb.Web\global.asax.cs:327 ASP.global_asax..ctor() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\2260aca7\1d63a2aa\App_global.asax.0.cs:0
The real issue with hitting the threshold
The problem at this point is that you cannot even access the Episerver Find administration to clear the index. What you must do is reseting the index at the find portal, http://find.episerver.com/MyServices
Thats it.