> ## Documentation Index
> Fetch the complete documentation index at: https://www.meilisearch.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Meilisearch v1.23 release notes

> Released October 13, 2025

## New Features

### Index Compaction Task

A new compaction endpoint is now available for indexes. This task defragments the LMDB environment used by each index, which reduces fragmentation that accumulates over time. Indexes typically experience around 30% fragmentation, and compaction can provide significant performance improvements (2-4x speed-ups) in search and indexation operations. This is achieved by reordering LMDB internal pages and removing scattered free pages throughout the file, relocating content to the beginning for better cache efficiency.

## Improvements

### Parallelized Facet Post-Processing

Facet post-processing during indexation is now multi-threaded. Previously, iterating over index prefixes was done in a single-threaded loop, which was a bottleneck. This redesign delivers 4-6x performance improvements for facet-related operations.

### Request UID Added to Search Routes

Search routes now include the request UID in responses, making it easier to track and correlate requests across your system.

[Find more information on GitHub](https://github.com/meilisearch/meilisearch/releases/tag/v1.23.0)


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