Getting Following Exception in CD Server where Xdb is enabled and rest all configs are disabled. Master Database has been turned to Pub Database(Live Database).
3248 21:44:46 ERROR Error loading hook: <hook type="Sitecore.ContentSearch.Hooks.Initializer, Sitecore.ContentSearch" patch:source="Sitecore.ContentSearch.config" xmlns:patch="http://www.sitecore.net/xmlconfig/" />
Exception: System.InvalidOperationException
Message: Could not find configuration node: marketingDefinitionSearch/indexConfigurations/marketingDefinitionLuceneIndexConfiguration
Source: Sitecore.Kernel
at Sitecore.Configuration.DefaultFactory.GetConfigNode(String xpath, Boolean assert)
at Sitecore.Configuration.DefaultFactory.CreateObject(String configPath, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.CreateFromReference(XmlNode configNode, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper)
at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.GetInnerObject(XmlNode paramNode, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.AssignProperties(XmlNode configNode, String[] parameters, Object obj, Boolean assert, Boolean deferred, IFactoryHelper helper)
at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper)
at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.GetInnerObject(XmlNode paramNode, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.AssignProperties(XmlNode configNode, String[] parameters, Object obj, Boolean assert, Boolean deferred, IFactoryHelper helper)
at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert, IFactoryHelper helper)
at Sitecore.Configuration.DefaultFactory.CreateObject(XmlNode configNode, String[] parameters, Boolean assert)
at Sitecore.Configuration.DefaultFactory.CreateObject(String configPath, String[] parameters, Boolean assert)
at Sitecore.ContentSearch.ContentSearchManager.get_SearchConfiguration()
at Sitecore.ContentSearch.Hooks.Initializer.Initialize()
at Sitecore.Events.Hooks.HookManager.LoadAll()
Though this is background error from log and I don't see any visible implication of this as of now. Any clue why it is so. You can find the showconfig output here