My search service shows this message 

My search service shows this message:  'The search application 'Search Service Name' on server SERVERNAME is not provisioned. Confirm that the Microsoft SharePoint Foundation Timer service and Central Administration service are running on the server'.  No changes can be made.  I am able to run search queries.

Every minute the Application Server Administration job tries and fails to provision the service and logs the event id 6482: Search not provisioned:  There is no project Portal_Content mounted under gatherer application <guid>

I've found a few posts online that have solved this by clearing the sharepoint cache, which I've done a number of times without success.  A few others re-created search which isn't a real good solution for me since we have a lot of customizations that would have to be redone.

Restoring from Central Admin backups is a possibility, but without knowing exactly what the problem is, it seems that this approach may cause further problems.

Thoughts anyone?  Here's the full event log message

-----------------------------------------------------------------------------------

Log Name:      Application
Source:        Microsoft-SharePoint Products-SharePoint Server
Date:          4/9/2015 8:00:38 PM
Event ID:      6482
Task Category: Shared Services
Level:         Error
Keywords:      
User:          domain\account
Computer:      SERVER.domain.com
Description:
Application Server Administration job failed for service instance Microsoft.Office.Server.Search.Administration.SearchServiceInstance (2aa54846-d503-4704-93ae-40a10a0ee56d).

Reason: There is no project Portal_Content mounted under gatherer application b7266a5e-78cb-4a72-b63b-e7e543bf3bcc.

Technical Support Details:
System.InvalidOperationException: There is no project Portal_Content mounted under gatherer application b7266a5e-78cb-4a72-b63b-e7e543bf3bcc.
   at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize()
   at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob)
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-SharePoint Products-SharePoint Server" Guid="{C33B4F2A-64E9-4B39-BD72-F0C2F27A619A}" />
    <EventID>6482</EventID>
    <Version>15</Version>
    <Level>2</Level>
    <Task>3</Task>
    <Opcode>0</Opcode>
    <Keywords>0x4000000000000000</Keywords>
    <TimeCreated SystemTime="2015-04-10T01:00:38.751328400Z" />
    <EventRecordID>337996</EventRecordID>
    <Correlation ActivityID="{4930FB9C-9CB7-D04C-62A0-7A17B669F3DD}" />
    <Execution ProcessID="16616" ThreadID="8460" />
    <Channel>Application</Channel>
    <Computer>SERVER.domain.com</Computer>
    <Security UserID="S-1-5-21-3958095517-670792205-3813086739-15822" />
  </System>
  <EventData>
    <Data Name="string0">Microsoft.Office.Server.Search.Administration.SearchServiceInstance</Data>
    <Data Name="string1">2aa54846-d503-4704-93ae-40a10a0ee56d</Data>
    <Data Name="string2">There is no project Portal_Content mounted under gatherer application b7266a5e-78cb-4a72-b63b-e7e543bf3bcc.</Data>
    <Data Name="string3">System.InvalidOperationException: There is no project Portal_Content mounted under gatherer application b7266a5e-78cb-4a72-b63b-e7e543bf3bcc.
   at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize()
   at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob)</Data>
  </EventData>
<