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docs/snippets/java/plugins/pdf_only_processor.md

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+```java title="Java"
+import dev.kreuzberg.PostProcessor;
+import java.util.HashMap;
+import java.util.Map;
+
+PostProcessor pdfOnly = result -> {
+    if (!result.getMimeType().equals("application/pdf")) {
+        return result;
+    }
+
+    Map<String, Object> metadata = new HashMap<>(result.getMetadata());
+    metadata.put("pdf_processed", true);
+
+    return result;
+};
+```