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When upgrading from 5.4 to 5.5 to 6.7 (inclusive) it was necessary to ensure there was a mapping for type "doc" on the ML state index before opening a job. This was because 5.4 created a multi-type ML state index. In version 7.x we can be sure that any such 5.4 index is no longer in use. It would have had to be reindexed into the 6.x index format prior to the upgrade to version 7.x.