Gets the index for the current thread when executing a job, otherwise 0.
When multiple threads are executing jobs, no two threads have the same index. The range of this property is [0, Unity.Jobs.LowLevel.Unsafe.JobsUtility.ThreadIndexCount)
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The value returned when used from within a job is the same as the value stored in job members decorated with [Unity.Collections.LowLevel.Unsafe.NativeSetThreadIndexAttribute]
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SA: Unity.Jobs.LowLevel.Unsafe.JobsUtility.ThreadIndexCount