Parse mix of String, JSON and KeyValue

2019-01-18T11:33:40,011 WXXX11100111L 43992 CM http-nio-8080-exec-8 MY-TEST POST configurations {a=b} {c=d, x=y} { "x": "abc", "country":"india", "lang":"EN", "project":"my-project"} 200 4266

I have the above log entry to be stashed using grok filter. The intent is to extract {a=b} & {c=d, x=y} as key value pair which could be blank also {}, and the the next token as a json information from the content. A sample grok filter could be like this.

%{TIMESTAMP_ISO8601:time} %{NOTSPACE:hostName} %{INT:pid} %{WORD:module} %{NOTSPACE:thread} %{NOTSPACE:CorrelationId} %{WORD:verb} %{NOTSPACE:path} %{???:kvQueryParameters} %{???:kvPathParameters} %{???:jsonObject} %{INT:response} %{INT:responseTime}

Really struggling to think through how to define the patterns for these three tokens in the log ? Moreover the value in key value pairs could contain url encoded strings while the JSON string could be {} to complex object.

I would split that grok to parse all the easy bits, then remove them from the message.

grok {
    break_on_match => false
    match => {
        "message" => [
            "^%{TIMESTAMP_ISO8601:time} %{NOTSPACE:hostName} %{INT:pid} %{WORD:module} %{NOTSPACE:thread} %{NOTSPACE:CorrelationId} %{WORD:verb} %{NOTSPACE:path}",
            " %{INT:response} %{INT:responseTime}$"
mutate {
    gsub => [
        "message", " [0-9]+ [0-9]+$", "",
        "message", "^[^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ [^ ]+ ", ""

Now that you just have the key-value pairs and the json, then provided the key-value pairs do not contain } you can get those using

grok { match => { "message" => [ "^{(?<kv1>[^}]*)}" ] } }
mutate { gsub => [ "message", "^{[^}]*} ", "" ] }

You do that again for the second one and everything that is left is json.

This is not working for me,the issue is with the path parameter.There is spaces in between and I am not able to remove's like this {a=b, c=d, e=f} {???:jsonObject}.
The output that I am receiving is like
kvpathparameter=> "{a=b,",
jsonObject=> "c=d, e=f} {???:jsonObject}"

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