In SharePoint 2013 farm we have a Search Service Application running. Due to a very long time required to run a full crawl, decision has been made few months ago to not to run full crawl regularly and keep only daily incremental crawls.
I want to justify to IT management that full crawl should be running regularly. This will help to get some resources to improve crawl performance.
The most "painful" consequence of not running full crawl in that farm I see that some items might be dropped from the index due to repeating incremental crawl errors. So I need to get an estimation on how many items are really missing from search index. Can anyone suggest how this can be done farm-wide, apart from checking/querying every item from crawl error log manually?