As a first step, I suggest you rebuild the content index from scratch, since I suspect you might have an corrupted index:
In addition to Luiz's answer, I would recommend to verify if the pages have contents in the database. The database should be there. If not, the database could be corrupted.
Just check the bodycontent table and look for the body column. You should not have blank results there otherwise the data from some pages are blank in the database. I would check a database backup for these data.
Some possibilities here, sir:
Hope it helps ya!
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