Is your query about how to determine what RIC to use to request specific data ?
If no: please give us more detail about what you are trying to achieve.
If you have access to an Eikon application, you can open a quote windows (press the F4 key to open one). Then either:
If you don't have an Eikon application you can use the speed guide available under the Tools section here.
Is there any way to get the data for only selected fid values with Elektron APi EMA java snapshot class as currently we see it gives the entire list of data for a particular service name and RIC feed value