Can JDT LS index Java files concurrently?

[nya3jp]

I'm setting up JDT LS for a project with many files (30k+), and finding out that it takes forever to index Java files. While my machine has 128 cores, the JDT LS process seems to use only ~6 cores. So I'm wondering if I'm setting it up wrongly to use only a limited number of cores. Does anybody know how to configure it correctly?

Note that I saw #825 and tried setting java.maxConcurrentBuilds to a large number, but it changed nothing. My understanding is that it allows multiple projects to build concurrently, but it doesn't affect concurrency within a project.

[mickaelistria]

Have you tried comparing with a plain Eclipse IDE ? Trying to figure out whether this is a LS specific issue, or something in JDT-Core, common to all its consumers.