Need to extract specific message from log

Elastic Stack Logstash
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address space usage: 1827991552 bytes/1743MB} {rss usage: 389292032 bytes/371MB} [pid: 19335|app: 0|req: 17171/48113] 10.195.0.169 () {50 vars in 816 bytes} [Mon Feb 21 04:06:57 2022] GET /web/test_name?name=sush => generated 37888 bytes in 83 msecs (HTTP/1.1 200) 4 headers in 132 bytes (1 switches on core 19)

I need to extract only test_name from above message please help me here

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