can't be indexed twice - testSourceDirectory and sourceDirectory are same

Question

I have created performance test as a maven submodule to my main module. All the test classes are written under src/main/java and not src/test

Answer 1

If project does not follow default Maven directory structure then in project's pom you can explicitly specify where is located the part of source code and the part of tests:

    src/main/foo
    src/test/bar