Degraded index partition yellow exclamation mark waring for sharepoint search index partition noticed. Sharepoint search correlation id error when user try to search. Yellow exclamation mark in sharepoint search Index partitioning warning indiactes towards search Index degraded.
You can run the command below to find index partition status.
$SearchServiceApplication = Get-SPEnterpriseSearchServiceApplication Get-SPEnterpriseSearchStatus -SearchApplication $SearchServiceApplication -Text
You can follow the blog below to find and analyze log based on the correlation id error you got while searching in sharepoint site.
Stopped crawling that were running and waited to check the status of index partition yellow exclamation mark waring. Wait for some time and check the index partition status.
Cleared config cache following the steps mentioned in blog below and then rebooted search server.
Restarted windows search services like SharePoint Search Host Controller and SharePoint Server Search 16 following steps below.
net stop SPSearchHostController net start SPSearchHostController net stop OSearch16 net start OSearch16
Open SharePoint Central Admin and click on Application Management from left navigation. Under Service Application click on Manage services on server. Identify the service SharePoint Server Search and click on Restart. If SharePoint Server Search stuck on Stopping state then follow the blog below to reprovision sharepoint search service.
Check event logs. If you are getting error with properties as below.
Event ID: 45
Task Category: Index Lookup
Description: Query2-78786d46-hd02-5b20-a3bd-e87sf943: Index lookup failed to work since no active index cell was available
Event ID: 283
Task category: Document Parsing
Description: Excel generic Format Handler failed to parse with exception: Max output size of 2000000 has been reached while parsing
Event ID: 169
Task category: SP index related tasks
Description: System Index2-94638-sb04-3b50-c3bd-b47be55cd877. Index system SPd92d9d4227cb. Invalidating index cell I.0.1
The above event logs give more confirmation that sharepoint search index corrupt. Finally do search index reset. Degraded index partition yellow warning will be resolved. You can follow the steps below to do search index reset.
Restart SharePoint Search Host Controller service.
net stop SPSearchHostController net start SPSearchHostController
Degraded index partition yellow exclamation mark waring is resolved. Start full crawling of all content sources.