Search module: full-text search, filtering, and faceting

[devIKargi]

Direction:
Build a search module offering full-text search and advanced filtering over core entities (users, content, messages). Support scalable backends (Elasticsearch or database full-text) and API endpoints for querying.

Acceptance criteria:

• Indexing pipeline for selected entities with near-real-time updates.
• Search API endpoint supporting full-text queries, field-based filtering, pagination, and sort.
• Support for faceted search counts for key fields (e.g., tags, status).
• Ability to switch between Elasticsearch and a fallback DB search with minimal config changes.
• Tests for indexing, search accuracy, and filter combinations.
• Docs detailing index schema, mapping, and tuning recommendations.

[Xaxxoo]

Hi, can I please take up on this issue ?

[grantfox-oss]

🦊 GrantFox — @Xaxxoo has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #369)
2. Your PR will be reviewed by the StellAIverse maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Third Campaign campaign!

@Xaxxoo's PR #381 was approved and merged by @devIKargi.

🏆 @Xaxxoo: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,385 total points). Track your full progress on GrantFox.

👏 Great work, @Xaxxoo! Keep contributing to StellAIverse.