Need software engineer. Help me create a client to export the data from an elastic server to an api

I have an api of different domain and i have an elastic server so i have to create a client to export the data from the elastic server to the said api.
I have barebones of client but the main code is pending.
I have some references of other packages of the client. And we need to do something like that. Cannot share the referencees here. Java based project.