I have two timestamp fields in my index and I want to calculate the time difference between two fields using scripted fields, and after that, I want to use fields in the visualization. is this possible?
Hi @lchen, Welcome 
Yes, this is possible: you can use multiple fields from a single document. Please note, that scripted fields are deprecated and runtime fields should be used instead.
You can find some of examples of runtime fields here: Getting started with runtime fields, Elastic’s implementation of schema on read | Elastic Blog
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i am using an old version so still have script fields instead of run time fields. would this still be possible?
Yes, here you can find some examples: Using Painless in Kibana scripted fields | Elastic Blog
I think you'd need something similar to Combine two string values example.
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