Nomad changes

docs/snippets/rust/metadata/pdf_only_processor.md

@@ -0,0 +1,23 @@
+```rust title="Rust"
+impl PostProcessor for PdfOnlyProcessor {
+    async fn process(
+        &self,
+        result: &mut ExtractionResult,
+        _config: &ExtractionConfig
+    ) -> Result<()> {
+        Ok(())
+    }
+
+    fn processing_stage(&self) -> ProcessingStage {
+        ProcessingStage::Middle
+    }
+
+    fn should_process(
+        &self,
+        result: &ExtractionResult,
+        _config: &ExtractionConfig
+    ) -> bool {
+        result.mime_type == "application/pdf"
+    }
+}
+```