[8.0] Fix CCS cluster compatibility (#2028) #2030
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Updates the upgrade guide to clarify BWC for CCS. Based on [the CCS docs](https://www.elastic.co/guide/en/elasticsearch/reference/master/modules-cross-cluster-search.html#ccs-supported-configurations), you can only search back one minor version. This means a local 8.1 cluster can only search remote 8.0+ clusters. Relates to elastic/kibana#125138 and #1970 (cherry picked from commit 70964c7)
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