[8.19] Fix union types in CCS (#128111) #128169
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dnhatn
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Currently, union types in CCS is broken. For example, FROM *:remote-indices | EVAL port = TO_INT(port) returns all nulls if the types of the port field conflict. This happens because converters are a map of the fully qualified cluster:index -name (defined in MultiTypeEsField), but we are looking up the converter using only the index name, which leads to a wrong or missing converter on remote clusters. Our tests didn't catch this because MultiClusterSpecIT generates the same index for both clusters, allowing the local converter to be used for remote indices.
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Backports the following commits to 8.19: