Search service application may not work in your sharepoint environment due to missing database upgrade throwing the below error.
The synchronization operation of the search component: 8bce98fb-8409-491d-877e-143590c9f055 associated to the search application: Search Service Application on server: VDIGL070404 has failed. The component version is not compatible with the search database: Search_Service_Application_CrawlStoreDB_4925b8b4b5574940ba8389bffd59423f on server: VDIGL070404. The possible cause for this failure is The database schema version is less than the minimum backwards compatibility schema version that is supported for this component. To resolve this problem upgrade this database..
In order to update the SharePoint databases, you must manually run the PSconfig utility. To run the utility:
Check if the server needs update with the following command in the sharepoint powershell admin,
If it returns TRUE, then follow the steps below
1. Open an Administrative command prompt.
2. Change directory to C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN
3. Run PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures
This may take couple of minutes to finish.