Shared Index is an new Feature in PhpStorm to pre-index an project and share the index to all users. Users will download the index and reuse it.
This is currently in Work in PhpStorm and does not hit very often.
Create a new file intellij.yaml
in your project with the content:
sharedIndex:
project:
- url: https://doex1q8n3l36c.cloudfront.net/project/sw6_trunk
After saving the file PhpStorm will question to download the shared index