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984d2ca2ba
ML has two types of custom cluster state: 1. jobs 2. datafeeds These need to be parsed from JSON in two situations: 1. Create/update of the job/datafeed 2. Restoring cluster state on startup Previously we used exactly the same parser in both situations, but this severely limits our ability to add new features. This is because the parser was very strict. This was good when accepting create/update requests from users, but when restoring cluster state from disk it meant that we could not add new fields, as that would prevent reloading in mixed version clusters. This commit introduces a second parser that tolerates unknown fields for each object that is stored in cluster state. Then we use this more tolerant parser when parsing cluster state, but still use the strict parser when parsing REST requests. relates elastic/x-pack-elasticsearch#1732 Original commit: elastic/x-pack-elasticsearch@754e51d1ec