You can notice that searchcore_text is nearly same size as post table, they just construct these 2 in different way.
If you do not rely on built in search then yes, you can truncate those tables (searchcore, searchgroup, searchlog etc) and completely disable search feature in settings.
But if you ever back to the built in search you need to rebuild search index, it will take a very long time so you have to make sure.
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