First create a CSV file, with all the current, and new names you want:
Animal,NewAnimal
Cat,Gato
Dog,Perro
Next, add your CSV file to Splunk, by going to Settings -> Lookups -> Lookup table files -> Add new
Choose your lookup file and give it a destination file name (it can be the same as the existing file name). Click Save.
Then, add a lookup definition by going to Settings -> Lookups -> Lookup definitions -> Add new
Give the lookup a name. Again, it can be the same as your file name, or you could simply call it "animals". Leave it on "File-based" and then select your CSV file from the drop-down menu. Click Save.
Now, you can use your lookup file in your search. Assuming you called the lookup definition "animals", you could do:
index="Foo" | lookup animals Animal OUTPUT NewAnimal| chart count by Timestamp, NewAnimal
... View more