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Adrien Grand 5821fa042c Cardinality aggregation. 
This aggregation computes unique term counts using the hyperloglog++ algorithm
which uses linear counting to estimate low cardinalities and hyperloglog on
higher cardinalities.

Since this algorithm works on hashes, it is useful for high-cardinality fields
to store the hash of values directly in the index, which is the purpose of
the new `murmur3` field type. This is less necessary on low-cardinality
string fields because the aggregator is smart enough to only compute the hash
once per unique value per segment thanks to ordinals, or on numeric fields
since hashing them is very fast.

Close #5426
 		2014-03-13 19:19:56 +01:00
..
analysis Expose `filler_token` via ShingleTokenFilterFactory 2014-02-26 22:21:10 +01:00
cat [TEST] fixed typo in _cat/thread_pool docs 2014-02-10 16:20:03 +01:00
cluster Add docs for plugin isolation 2014-03-11 12:32:58 +02:00
docs Introduced VersionType.FORCE & VersionType.EXTERNAL_GTE 2014-03-10 21:07:17 +01:00
images Cardinality aggregation. 2014-03-13 19:19:56 +01:00
index-modules [DOCS] Multiple doc fixes 2014-03-07 14:24:58 +01:00
indices [DOCS] Multiple doc fixes 2014-03-07 14:24:58 +01:00
mapping [DOCS] Multiple doc fixes 2014-03-07 14:24:58 +01:00
migration [DOCS] Included the `_percolator` index breaking change to migration docs. 2014-02-20 16:43:06 +01:00
modules Add docs for plugin isolation 2014-03-11 12:32:58 +02:00
query-dsl [DOCS] Formatting error 2014-03-05 17:40:51 +01:00
search Cardinality aggregation. 2014-03-13 19:19:56 +01:00
setup [DOCS] Fix wrong explanation in configuration.asciidoc 2014-02-24 11:29:50 +01:00
testing [TEST] Randomized number of shards used for indices created during tests 2014-03-10 13:01:52 +01:00
analysis.asciidoc Add more anchor links to documentation 2013-09-30 13:13:16 -06:00
api-conventions.asciidoc Added the `DistanceUnit.NAUTICALMILES` enumeration 2014-02-14 19:48:58 +09:00
cat.asciidoc Display all available endpoints by default at /_cat 2014-03-07 13:21:43 -06:00
cluster.asciidoc [DOCS] Fix HTTP endpoints after stats API changes 2014-01-09 11:30:28 +01:00
docs.asciidoc [DOCS] Moved termvector and mtermvectors from search to docs 2014-01-22 14:10:26 +01:00
glossary.asciidoc Migrated documentation into the main repo 2013-08-29 01:24:34 +02:00
index-modules.asciidoc Removed 0.90.* deprecation and addition notifications 2014-02-07 20:52:49 +01:00
index.asciidoc [DOCS] Added breaking changes in 1.0 2014-01-15 17:50:24 +01:00
indices.asciidoc Add a GetFieldMapping API 2013-10-30 16:16:36 +01:00
mapping.asciidoc [DOCS] Moved multi fields documentation into the core-types page 2014-01-22 10:05:58 +01:00
modules.asciidoc [DOCS] Fixed link to tribe.asciidoc 2014-01-13 22:01:12 +01:00
query-dsl.asciidoc Migrated documentation into the main repo 2013-08-29 01:24:34 +02:00
search.asciidoc [DOCS] Moved termvector and mtermvectors from search to docs 2014-01-22 14:10:26 +01:00
setup.asciidoc [DOCS] Make apt/yum repos more visible 2014-02-06 17:04:37 +01:00
testing.asciidoc [DOCS] Test framework documentation 2013-12-02 18:01:45 +01:00