rgw: tagging field support nested search

[tianshan]

add mapping for tagging field

fixes: http://tracker.ceph.com/issues/23882

Signed-off-by: Tianshan Qu tianshan@xsky.com

[tianshan]

I think custom type use "key" is better instead of "name" , if so, I will just modify dump_custom

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[theanalyst]

I guess text/string still makes sense here, keyword expects exact matches, not sure whether that is strictly necessary for tagging (may be for tagging keys?)

[tianshan]

@theanalyst no, without nested type, we can not match one tag key from the tagging group

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[theanalyst]

nested type is ok; was just debating on keyword type, but looks good as is.

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[ZVampirEM77]

@theanalyst ping

[ZVampirEM77]

I think the accuracy of metadata searching will be improved if we modify the tagging field to nested type.

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