rustdoc: Enabling mergeable CCI broke the search functionality for the stdlib and for our internal docs

[fmease]

Over at https://doc.rust-lang.org/nightly/nightly-rustc, it's impossible to find rustc_ast::ast::Attribute directly via the search feature.

Attribute

It doesn't matter if I search rustc_ast::ast::Attribute, rustc_ast::Attribute, ast::Attribute or Attribute.

ast::Attribute & rustc_ast::Attribute & rustc_ast::ast::Attribute

Here, it "at least" indirectly lists the correct type as part of an associated function.

[fmease]

This feels like a regression.

I don't know if it's a rustdoc regression, a bootstrap regression or if it's only exhibited now because we've changed the compiler crates in some way like adding some public re-exports of rustc_ast::ast or rustc_ast::ast::Attribute to some other compiler crate (CC #145870 which is only tangentially related).

[theemathas]

This also affects searching of the standard library (as of 0ed41eb41 2026-09-04). Searching for "PathBuf" doesn't find the PathBuf type. https://doc.rust-lang.org/nightly/std/index.html?search=PathBuf

[fmease]

Most likely due to #161716? That PR got merged 2 days ago, so part of nightly-2026-09-03 (rustc version) aka nightly-2026-09-04 (toolchain name) and it's very plausible that it messed with the search indices.

cc @notriddle