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@@ -115,6 +115,9 @@ indices from the previous major version to be upgraded to the
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current major version. Skipping a major version means that you must
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resolve any backward compatibility issues yourself.
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+{es} does not support forward compatibility across major versions.
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+For example, you cannot reindex from a 7.x cluster into a 6.x cluster.
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+
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ifdef::include-xpack[]
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If you use {ml-features} and you're migrating indices from a 6.5 or earlier
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cluster, the job and {dfeed} configuration information are not stored in an
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James Rodewig