Whenever you want to add a new one or edit an existing index, you will be redirected to the Index Edit View. This view helps you shape the index definition by providing code-completion, formatters, C# code generator, and more.
The following actions are available in the Action Bar:
Save - saves an index on a server (if the index existed and the definition changed, then previous indexing data will be lost),
Add - you can add another mapping or reducing function, define field, or spatial field, and determine max index outputs,
Priority - ability to change an index priority. More here,
Format - perform code formatting for mapping and reducing functions,