How boolean fields are indexed in ElasticSearch? Doc values on boolean?

Elastic Stack Elasticsearch
1

Hi,

I'm taking some time reviewing our mapping.
We've put doc_values for the fields that aggregation will be calculated.
But I'm not sure is there any benefit to do this for boolean field?
This also leads me to wonder how ElasticSearch (or Lucene) index boolean
fields?

Some insights or readings? Thanks

Han

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2

Hi,

Boolean fields don't support doc values yet, although there is some work in
progress: Add doc values support to boolean fields. by jpountz · Pull Request #7961 · elastic/elasticsearch · GitHub

Boolean fields are simply indexed as strings: "T" for true and "F" for
false and field data would require about 2 bits per document (one to know
if the document has a value, and one to store the value). That's not much
but it can still use quite some memory if you have lots of memory. If/when
doc values support comes to booleans, this will help move most of this
memory usage to disk and the filesystem cache.

On Thu, Oct 2, 2014 at 2:19 PM, Han JU ju.han.felix@gmail.com wrote:

Hi,

I'm taking some time reviewing our mapping.
We've put doc_values for the fields that aggregation will be calculated.
But I'm not sure is there any benefit to do this for boolean field?
This also leads me to wonder how Elasticsearch (or Lucene) index boolean
fields?

Some insights or readings? Thanks

Han

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Adrien Grand

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