Optimize page: content/english/java/metadata-management/groupdocs-comparison-java-custom-metadata-guide/_index.md - - Updated title and meta description to embed primary and secondary keywords.

- Added front‑matter date update and a `keywords` list for SEO.
- Inserted a “Quick Answers” section right after the introduction for AI summarization.
- Added question‑style H2 headings that include primary and secondary keywords.
- Expanded explanations, use‑case examples, and troubleshooting tips for human engagement.
- Improved the FAQ answers and formatted them for AI citation.
- Added trust‑signal block (last updated, tested version, author) at the end of the article.

Author: muqarrab-aspose