How to configure Algolia search correctly

[Red-Asuka]

I have some questions about Algolia search. My goal is to achieve a search effect similar to that of the vuejs.org website, which can be classified according to the directory on the left. I tried to configure the search function myself, but the test results show that the search may return empty titles. I don't know why. So, I would like to ask if anyone can share the optimized configuration of Algolia search for websites built with Vitepress? Or could someone share the search configuration of the vuejs.org website? I would be very grateful.

Here is my current search configuration:

{
  "index_name": "index",
  "sitemap_urls": [],
  "selectors": {
    "lvl0": ".VPSidebarItem.level-0.has-active .item .text",
    "lvl1": ".vp-doc h1",
    "lvl2": ".vp-doc h2",
    "lvl3": ".vp-doc h3",
    "lvl4": ".vp-doc h4",
    "text": ".vp-doc p,.vp-doc li"
  },
  "custom_settings": {
    "attributesForFaceting": ["lang", "language", "product", "version"]
  }
}