[[cat-fielddata]]
== cat fielddata

`fielddata` shows how much heap memory is currently being used by fielddata 
on every data node in the cluster.

[source,sh]
--------------------------------------------------
% curl '192.168.56.10:9200/_cat/fielddata?v'
id                     host    ip            node          field   size
c223lARiSGeezlbrcugAYQ myhost1 10.20.100.200 Jessica Jones body    159.8kb
c223lARiSGeezlbrcugAYQ myhost1 10.20.100.200 Jessica Jones text    225.7kb
waPCbitNQaCL6xC8VxjAwg myhost2 10.20.100.201 Adversary     body    159.8kb
waPCbitNQaCL6xC8VxjAwg myhost2 10.20.100.201 Adversary     text    275.3kb
yaDkp-G3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 Microchip     body    109.2kb
yaDkp-G3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 Microchip     text    175.3kb
--------------------------------------------------

Fields can be specified either as a query parameter, or in the URL path:

[source,sh]
--------------------------------------------------
% curl '192.168.56.10:9200/_cat/fielddata?v&fields=body'
id                     host    ip            node          field   size
c223lARiSGeezlbrcugAYQ myhost1 10.20.100.200 Jessica Jones body    159.8kb
waPCbitNQaCL6xC8VxjAwg myhost2 10.20.100.201 Adversary     body    159.8kb
yaDkp-G3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 Microchip     body    109.2kb

% curl '192.168.56.10:9200/_cat/fielddata/body,text?v'
id                     host    ip            node          field   size
c223lARiSGeezlbrcugAYQ myhost1 10.20.100.200 Jessica Jones body    159.8kb
c223lARiSGeezlbrcugAYQ myhost1 10.20.100.200 Jessica Jones text    225.7kb
waPCbitNQaCL6xC8VxjAwg myhost2 10.20.100.201 Adversary     body    159.8kb
waPCbitNQaCL6xC8VxjAwg myhost2 10.20.100.201 Adversary     text    275.3kb
yaDkp-G3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 Microchip     body    109.2kb
yaDkp-G3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 Microchip     text    175.3kb
--------------------------------------------------

The output shows the individual fielddata for the`body` and `text` fields, one row per field per node.