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An Index Should Be Configured for Database Web Error Is Preventing the REST Service From Loading

This is for:

Developer System Administrator

Symptoms

When loading the Coveo for Sitecore REST endpoint proxy, any Coveo Search component, or the Diagnostic page, you might get the following error:

Exception: System.InvalidOperationException
Message: An index should be configured for database "web".
Source: Coveo.UIBase
   at Coveo.UI.Helpers.SitecoreHelper.GetSearchIndex()
   at Coveo.SearchProvider.Rest.SitecoreRestHttpHandler.GetSecurityProviderName()
   at Coveo.SearchProvider.Rest.SitecoreRestHttpHandler.OnInitializeSettings()
   at Coveo.Search.Api.Proxy.ProxyHttpHandler.OnInitialize()
   at Coveo.Search.Api.Proxy.ProxyHttpHandler.EnsureInitialized()
   at Coveo.Search.Api.Proxy.ProxyHttpHandler.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Cause

There are several causes for this issue. You’re encouraged to look through the Coveo Q&A forum to identify your problem. If this doesn’t solve your issue, be aware that there’s a Sitecore bug which binds new indexes configuration to item buckets.

Therefore, if the following setting value is false:

<setting name="BucketConfiguration.ItemBucketsEnabled" value="false" />

Then ContentSearchManager.SearchConfiguration is initialized as an empty one.

The bug was confirmed on Sitecore 7.5

Workaround

To solve the issue, enable item buckets in the Sitecore configuration:

<setting name="BucketConfiguration.ItemBucketsEnabled" value="true" />