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Today when an index is created from shrinking or splitting an existing index, the target index inherits almost none of the source index settings. This is surprising and a hassle for operators managing such indices. Given this is the default behavior, we can not simply change it. Instead, we start by introducing the ability to copy settings. This flag can be set on the REST API or on the transport layer and it has the behavior that it copies all settings from the source except non-copyable settings (a property of a setting introduced in this change). Additionally, settings on the request will always override. This change is the first step in our adventure: - this flag is added here in 7.0.0 and immediately deprecated - this flag will be backported to 6.4.0 and remain deprecated - then, we will remove the ability to set this flag to false in 7.0.0 - finally, in 8.0.0 we will remove this flag and the only behavior will be for settings to be copied