klever

file redisearch/bin/wp-cli.php,
line 243:
$posts_per_page = Settings::get( ‘wp_redisearch_indexing_batches’, 50 );

$posts_per_page will be 0 if the setting was left bank here /admin.php?page=indexing-options, but the right thing is it should be 50 by default.

I am using php7.2