When we tried to search coming up with below error.
attached respective ULS logs pertaining to above correlation id
and I see search topology index partition shows 0 with warning symbol.
I have googled , below is the status (degrade status) of index partition
we have rebooted app servers, config cache clear and restarted the serach host controller service nothing fixed.
please let me know what can be done other than running full crawl and index reset, because full crawl takes 4 days to completed. index reset not good option. 
and I see timer job recyle failure, what is the cause for it? and what is the solution? and it is happening only on app servers. 


