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docs/snippets/elixir/plugins/unregister_plugins.md

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+<!-- snippet:skip reason="Elixir Rustler NIFs cannot host async Send + Sync + 'static Rust trait objects via callbacks; the BEAM actor-model boundary requires plugin work to live in the Rust core. The alef-generated Elixir trait_call macro additionally has a backslash/encoding bug (separate alef-codegen ticket). Custom plugins must be implemented in Rust." -->
+Plugin unregistration is not available in the Elixir binding. Plugin unregistration must be done in Rust using the registry APIs.
+
+To unregister a specific plugin in Rust:
+
+```rust
+use kreuzberg::plugins::registry::get_document_extractor_registry;
+
+let registry = get_document_extractor_registry();
+registry.remove("custom-json-extractor")?;
+```
+
+In Elixir, you can only clear all plugins of a specific type using:
+
+- `Kreuzberg.clear_document_extractors()`
+- `Kreuzberg.clear_post_processors()`
+- `Kreuzberg.clear_ocr_backends()`
+- `Kreuzberg.clear_validators()`
+
+To remove a single plugin, you must do so from the Rust core before Elixir starts using it.