Fix downsample persistent task params serialization (#106878) #106896
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Missing a check on the transport version results in unreadable cluster state if it includes a serialized instance of DownsampleShardTaskParams. serie indices. Reading an optional array requires reading a boolean first which is required to know if an array of values exists in serialized form. From 8.13 on we try to read such a boolean which is not there because older versions don't write any boolean nor any string array. Here we include the check on versions for backward compatibility skipping reading any boolean or array whatsoever whenever not possible. Customers using downsampling might have cluster states including such serielized objects and would be unable to upgrade to version 8.13. They will be able to upgrade to any version including this fix. This fix has a side effect elastic#106880
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Missing a check on the transport version results in unreadable cluster
state if it includes a serialized instance of DownsampleShardTaskParams.
serie indices. Reading an optional array requires reading a boolean
first which is required to know if an array of values exists in
serialized form. From 8.13 on we try to read such a boolean which is not
there because older versions don't write any boolean nor any string
array. Here we include the check on versions for backward compatibility
skipping reading any boolean or array whatsoever whenever not possible.
Customers using downsampling might have cluster states including such
serielized objects and would be unable to upgrade to version 8.13. They
will be able to upgrade to any version including this fix.
This fix has a side effect #106880
Backport of #106878 to 8.13