Kibana Search Question

Hi,
i'm using ELK for stop my API logs
My message contains a json with an API request, something like that

{"initObj": {"mediaType": 0, "pageSize": 100, "pageIndex": 0, "exact":
false, "orderBy": "NONE", "orderDir": "ASC", "orderMeta": ""}

I'm looking to find all the massages where "pageSize" in greater than 50.
Is there a way to do so? Without filtering pageSize in logstash

Thanks
AK

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