[[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
bGG90GEiSGeezlbrcugAYQ myhost1 10.20.100.200 bGG90GE body  159.8kb
bGG90GEiSGeezlbrcugAYQ myhost1 10.20.100.200 bGG90GE text  225.7kb
H5dfFeANQaCL6xC8VxjAwg myhost2 10.20.100.201 H5dfFeA body  159.8kb
H5dfFeANQaCL6xC8VxjAwg myhost2 10.20.100.201 H5dfFeA text  275.3kb
I8hydUG3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 I8hydUG body  109.2kb
I8hydUG3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 I8hydUG 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
bGG90GEiSGeezlbrcugAYQ myhost1 10.20.100.200 bGG90GE body  159.8kb
H5dfFeANQaCL6xC8VxjAwg myhost2 10.20.100.201 H5dfFeA body  159.8kb
I8hydUG3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 I8hydUG body  109.2kb

% curl '192.168.56.10:9200/_cat/fielddata/body,text?v'
id                     host    ip            node    field size
bGG90GEiSGeezlbrcugAYQ myhost1 10.20.100.200 bGG90GE body  159.8kb
bGG90GEiSGeezlbrcugAYQ myhost1 10.20.100.200 bGG90GE text  225.7kb
H5dfFeANQaCL6xC8VxjAwg myhost2 10.20.100.201 H5dfFeA body  159.8kb
H5dfFeANQaCL6xC8VxjAwg myhost2 10.20.100.201 H5dfFeA text  275.3kb
I8hydUG3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 I8hydUG body  109.2kb
I8hydUG3R0q1AJ-HUEvkSQ myhost3 10.20.100.202 I8hydUG text  175.3kb
--------------------------------------------------

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