OpenSearch/docs/reference/cat/fielddata.asciidoc

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[[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.