How to drop a block of lines in logstash filter?

I have these lines in my websphere Systemout.log file:

************ Start Display Current Environment ************
line 1
line 2
line 3
line 4
line 5
line 7
************* End Display Current Environment *************

How can I match the block of this start and end pattern and drop all the lines in between including the start and end line?

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