Is the plugin is compatible with WPML ?
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No, you shouldn't pay. Just get your copy for free and make experiments with it. If you don't like what happens - just remove it and that's it. No need to pay or cancel something.
@epsilonadmin custom block.
Here is info how to create block - https://www.advancedcustomfields.com/blog/acf-5-8-introducing-acf-blocks-for-gutenberg/
So we register new block, assigned fields for this block.
We add block on page. When I try to search phrase from one of these field - page not added to search result
Should be you are using the "WPFTS :: Live Search" widget. This widget is intended to show this live search data. If you don't want them, simply use the native WP Search widget.
Hope it helps.