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@@ -372,3 +372,21 @@ image:images/ccs/ccs-dont-min-roundtrip-shard-results.svg[]
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final results in the {ccs} response.
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+
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image:images/ccs/ccs-min-roundtrip-client-response.svg[]
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+
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+[discrete]
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+[[ccs-supported-configurations]]
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+=== Supported configurations
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+
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+Generally, <<gateway-nodes-selection, cross cluster search>> can search remote
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+clusters that are one major version ahead or behind the coordinating node's
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+version. Cross cluster search can also search remote clusters that are being
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+<<rolling-upgrades, upgraded>> so long as both the "upgrade from" and
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+"upgrade to" version are compatible with the gateway node.
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+
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+For example, a coordinating node running {es} 5.6 can search a remote cluster
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+running {es} 6.8, but that cluster can not be upgraded to 7.1. In this case
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+you should first upgrade the coordinating node to 7.1 and then upgrade remote
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+cluster.
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+
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+WARNING: Running multiple versions of {es} in the same cluster beyond the
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+duration of an upgrade is not supported.
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Nik Everett