Increment data load in json file

Hi,
i have two json file. usermaster json file contains history data, user json files contains new data. email id is unique in both files. Based on email id, i want to updated already existing data. i.e) i want to remove email id related record present in history json file and replace with record in new data json file.

I am trying to do incremental load when new data coming in, replace old data with new data.

I need java code for the task.

Help me to solve the task

I’m not sure what you mean by this. Are you looking for an answer in Java? This section says “General Question”, but this is still the an Elixir programming language forum.