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To index unindexed posts, use
relevanssi_build_index( true, false, 100 );
where 100 is the number of posts to index at one go. How high you can go depends on various details; you want the number to be as high as possible but low enough that PHP doesn’t time out while the indexing is still going. Start from 100 and see where that gets you.
Post types and the rest come from Relevanssi indexing settings and don’t need to be specified here.