First, thank you for sharing this helpful link, but LOL at needing to use a third party server to search plain text data that could fit in RAM (at least on this developer's machine). JavaScript- and JSON-based developer tooling is a terrible idea.
> [r]unning clangd-indexer is expensive and produced index is not incremental.
VSCode itself can deal with big text data being thrown at it, this will be some of the language server stuff
The only time I had problems was very big JSONs with everything on one line, but prettifying fixed that. (Or was it XML? I forgot. One of those.)