IntelliJ IDEA is a popular IDE for programming languages.
When you open an existing maven or gradle or npm project in IntelliJ IDEA, It starts updating the index at startup for a couple of minutes and IDEA will not respond and is unstable. Usually, If it is a new project, the index takes a longer time, Next opening the project only updates the index for the files that were added/deleted.
IntelliJ IDEA index issue forever
Sometimes, Indexing takes a longer time, and the user is unable to do any operation in IDEA.
The below steps are required to improve the index update.
Go to the File menu and choose the Invalidate Cache or Restart option.
If the above steps do not solve the issue, follow the next steps
imlfiles in the project folder
Increase memory in IDEA
disable third-party plugins
You can also exclude the folder in the current project
Goto File -> Project Settings -> Modules -> Sources