A lot of optimizations and quite a few improvements and bug fixes since last release.

BREAKING CHANGE: A problem with generated terms in geospatial fields will require reindexing documents using such geospatial fields.

Xapiand is now using a whole new threadpool with lock-free queue for improved performance.

Restore command is now indexing documents in parallel using multiple threads which yields better performance while bulk indexing.

The release also fixes a serious multithreading bug with collected statistics.

• Parallel restore commands
• General optimizations
• Fixed geospatial terms and accuracy
• Fixes storage (no longer returns 500)
• Fixes multithreading bug with collected statistics