I was reading up on when ES builds fielddata
: https://www.elastic.co/guide/en/elasticsearch/guide/current/fielddata.html
A footnote on this page reads 'It is required for any operation that needs
to look up the value contained in a specific document'.
Would this also be true when building buckets in a date_histogram
aggregation ? Date fields are bound to have high cardinalilty so I would
imagine that if populating fielddata would be counterproductive.
In what cases while building aggregations does the above mentioned pattern
not apply ?
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Ignore the bit about high cardinality.
IMO, the use of fielddata for date_historgram is counter intuitive, since
the buckets made a ranges as defined by the grain, and therefore the
buckets are pre-defined in a sense which means the inverted index should
itself be sufficient for building the buckets, fielddata is not required.
Is this how a date_histogram actually behaves under the covers ?
On Tuesday, March 10, 2015 at 1:43:13 PM UTC-7, Anant Aneja wrote:
I was reading up on when ES builds fielddata :
https://www.elastic.co/guide/en/elasticsearch/guide/current/fielddata.html
A footnote on this page reads 'It is required for any operation that needs
to look up the value contained in a specific document'.
Would this also be true when building buckets in a date_histogram
aggregation ? Date fields are bound to have high cardinalilty so I would
imagine that if populating fielddata would be counterproductive.
In what cases while building aggregations does the above mentioned pattern
not apply ?
--
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