Migration
This folder stores migration data used by macOS Spotlight document processing inside CoreSpotlight's PipelineStorage area.
What is Migration?
Migration is a folder in your user Library used by macOS CoreSpotlight document processing. CoreSpotlight helps the system organize and update searchable metadata so files and app content can appear in Spotlight results and other search features. This location sits under ~/Library/Metadata/CoreSpotlight/DocumentProcessing/PipelineStorage, which indicates it is part of an internal storage area for search indexing workflows rather than a normal document folder. Users may encounter it while reviewing Library storage or cleaning up disk space. Because it supports system search metadata handling, removing it can force macOS or related apps to rebuild indexing data and may temporarily affect search results or processing performance.
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Safety overview
Status: Mostly safe
This is a macOS support folder, not a user document folder. It may contain temporary or transitional data used while Spotlight-related metadata is updated. Deleting it is not typically dangerous to personal files, but it can interrupt indexing work, cause search metadata to rebuild, or temporarily reduce the accuracy or speed of search features until macOS recreates the data.
Recommendation: Keep this folder if you want Spotlight and related search features to continue working without rebuild delays. If you are troubleshooting indexing problems or reclaiming a small amount of space, you can remove it cautiously, then expect macOS to recreate it and spend time rebuilding related metadata.
File path
~/Library/Metadata/CoreSpotlight/DocumentProcessing/PipelineStorage/Migration
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