[ML] Option to use endpoints starting _ml instead of _xpack/ml #36373
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In #36315 ML's _xpack/ml endpoints are deprecated, with the
recommended form becoming _ml. This change allows use of the
new form in 6.x to facilitate operation of a mixed version
6.last/7.x cluster without suffering from deprecation warnings.
The new endpoints remain undocumented in 6.x but are documented
in the 7.0 PR #36315.