Grok can't create optional fields

[Bhavin_Varsur]

I'm trying to parse logs in logstash with use of grok. In error log there are two more optional fields like requestUrl and requestMethod. but when i use grok for parsing logs to logstash.these from the error log grok can't create these two fields. here is my grok pattern :

    if [fields][log_type] == "finance" 
        {
           if [level] in [ "Error", "Fatal" ] 
            {
                grok {
                    match=> ["message","%{DATESTAMP:time} \[%{WORD:processId}\] %{LOGLEVEL:level} %{USERNAME:logger} %{USER:user} %{IPV4:clientIp} %{URI:requestUrl} %{USER:requestMethod} %{GREEDYDATA:message}"]
                    overwrite => [ "message" ]
                    }
                    mutate { gsub => ["message", "\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}.\d{4} ",""]}
                    mutate { gsub => ["message", "%{level}",""]}
                    mutate { gsub => ["message", "%{logger}",""]}
                    mutate { gsub => ["message", "%{clientIp}",""]}
            }
            else
            {
                grok {
                    match=> ["message","%{DATESTAMP:time} \[%{WORD:processId}\] %{LOGLEVEL:level} %{USERNAME:logger} %{USER:user} %{IPV4:clientIp} %{GREEDYDATA:message}" ]
                    overwrite => [ "message" ]
                    }
                    mutate { gsub => ["message", "\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}.\d{4} ",""]}
                    mutate { gsub => ["message", "%{level}",""]}
                    mutate { gsub => ["message", "%{logger}",""]}
                    mutate { gsub => ["message", "%{clientIp}",""]}
            }
       }  

here are my log sample :

2020-10-10 12:25:07.0891 [35476] DEBUG Program bhavin 192.168.43.244 init main 
2020-10-10 12:25:09.8357 [35476] WARN HttpsRedirectionMiddleware bhavin 192.168.43.244 Failed to determine the https port for redirect. 
2020-10-10 12:25:10.7106 [35476] ERROR DeveloperExceptionPageMiddleware bhavin 192.168.43.244 http://bhavin/Transactions POST An unhandled exception has occurred while executing the request.System.InvalidOperationException

here is the image of kibana view :

you can see other fields are created but these two are not created