[Rails] Adding table index through rails

Hello,
could someone please tell me how I can add a Mysql table index through
my rails app. without using a migration, ie from within my app ?

ie how I can call the add_index() method here >
ActiveRecord::ConnectionAdapters::SchemaStatements.add_index().

I don't quite understand what I need to include or require for the
add_index method to become available for me to use.

thanks in advance,

Hal

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