Grok parser question (Invalid json string)

Hi,please assit me with creating custom grok pattern .

I've created custom pattern, it works perfectly in Grok Debugger.

But i cant add this expression for parsing data:

Error: Invalid Json string.

%{SYSLOGTIMESTAMP:syslog_timestamp} %{IPORHOST:syslog_server} %{SYSLOGPROG}: %{IP:client_ip}:%{INT:client_port} \[%{HAPROXYDATE:accept_date}\] %{NOTSPACE:frontend_name} %{NOTSPACE:backend_name}/%{NOTSPACE:server_name} %{INT:time_request}/%{INT:time_queue}/%{INT:time_backend_connect}/%{INT:time_backend_response}/%{NOTSPACE:time_duration} %{INT:http_status_code} %{NOTSPACE:bytes_read} %{DATA:captured_request_cookie} %{DATA:captured_response_cookie} %{NOTSPACE:termination_state} %{INT:actconn}/%{INT:feconn}/%{INT:beconn}/%{INT:srvconn}/%{NOTSPACE:retries} %{INT:srv_queue}/%{INT:backend_queue} {%{DATA:request_header_x_forwarded_for}\|%{DATA:request_header_user_agent}\|%{DATA:request_header_referer}} "%{WORD:http_verb} %{URIPATHPARAM:http_request}( HTTP/%{NUMBER:http_version}")?

ELK 7.12 / haproxy 1.8

Thanks for any help!

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