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I have an index defined like
add_index :users, :email, :unique => true
Is there any way to change this index to drop the UNIQUE constraint, something like ‘change_index’?
Or is it the only way to drop the index and add it again without the UNIQUE constraint?
Different index types are typically implemented in very different ways in the database you are using. A primary index is very different from any secondary index. And unique indexes are typically different from search indexes to facilitate their primary use case: to quickly determine if a value is already present in a column vs. allowing efficient searches.
As such, (depending on your DBMS) you can’t change an existing index. You safest bet in any case is to drop the index and create a new one. This can be done during live operations. There is no need to shutdown neither the database nor your rails app.