Sorry, but No. That is not the best answer. That is a horrible, generic answer, just pointing me at some documentation. Your answer provides less information then I can get from a basic google search. Rediculous.
As per attached document:
Indicates the ECS name. It is automatically generated and can be changed.
My Answer (Inferred from several documets)
Specifies the ECS name.
The value contains 1 to 255 characters.
When you create ECSs in in a batch and customize the ECS names, you can set the suffix of the first ECS name by entering an integer in the range 0001 to 9999. The name suffix of each of the remaining ECSs increments by 1 in sequence.
Please provide detailed descriptions of the fields above or relevant documentation if possible.