github-mirrors/elasticsearch
1
0
Fork 0
mirror of https://github.com/elastic/elasticsearch.git synced 2025-06-28 17:34:17 -04:00
Code Issues Projects Releases Packages Wiki Activity

Docs: Prepare plugin and integration docs for 2.0

Browse source 
* Centralised plugin docs in docs/plugins/
* Moved integrations into same docs
* Moved community clients into the clients section of the docs
* Removed docs/community

Closes #11734
Closes #11724
Closes #11636
Closes #11635
Closes #11632
Closes #11630
Closes #12046
Closes #12438
Closes #12579
This commit is contained in:
Clinton Gormley 2015-08-15 18:00:55 +02:00
parent 42300938aa
commit e143c6e460
49 changed files with 4444 additions and 3503 deletions
Download patch file Download diff file Expand all files Collapse all files

193
docs/plugins/lang-javascript.asciidoc Normal file
View file

@ -0,0 +1,193 @@
[[lang-javascript]]
=== JavaScript Language Plugin
The JavaScript language plugin enables the use of JavaScript in Elasticsearch
scripts, via Mozilla's
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/Rhino[Rhino JavaScript] engine.
[[lang-javascript-install]]
[float]
==== Installation
This plugin can be installed using the plugin manager:
[source,sh]
----------------------------------------------------------------
sudo bin/plugin install lang-javascript
----------------------------------------------------------------
The plugin must be installed on every node in the cluster, and each node must
be restarted after installation.
[[lang-javascript-remove]]
[float]
==== Removal
The plugin can be removed with the following command:
[source,sh]
----------------------------------------------------------------
sudo bin/plugin remove lang-javascript
----------------------------------------------------------------
The node must be stopped before removing the plugin.
[[lang-javascript-usage]]
==== Using JavaScript in Elasticsearch
Once the plugin has been installed, JavaScript can be used at a scripting
language by setting the `lang` parameter to `javascript` or `js`.
Scripting is available in many APIs, but we will use an example with the
`function_score` for demonstration purposes:
[[lang-javascript-inline]]
[float]
=== Inline scripts
WARNING: Enabling inline scripting on an unprotected Elasticsearch cluster is dangerous.
See <<lang-javascript-file>> for a safer option.
If you have enabled {ref}/modules-scripting.html#enable-dynamic-scripting[inline scripts],
you can use JavaScript as follows:
[source,json]
----
DELETE test
PUT test/doc/1
{
"num": 1.0
}
PUT test/doc/2
{
"num": 2.0
}
GET test/_search
{
"query": {
"function_score": {
"script_score": {
"script": {
"inline": "doc[\"num\"].value * factor",
"lang": "javascript",
"params": {
"factor": 2
}
}
}
}
}
}
----
// AUTOSENSE
[[lang-javascript-indexed]]
[float]
=== Indexed scripts
WARNING: Enabling indexed scripting on an unprotected Elasticsearch cluster is dangerous.
See <<lang-javascript-file>> for a safer option.
If you have enabled {ref}/modules-scripting.html#enable-dynamic-scripting[indexed scripts],
you can use JavaScript as follows:
[source,json]
----
DELETE test
PUT test/doc/1
{
"num": 1.0
}
PUT test/doc/2
{
"num": 2.0
}
POST _scripts/javascript/my_script <1>
{
"script": "doc[\"num\"].value * factor"
}
GET test/_search
{
"query": {
"function_score": {
"script_score": {
"script": {
"id": "my_script", <2>
"lang": "javascript",
"params": {
"factor": 2
}
}
}
}
}
}
----
// AUTOSENSE
<1> We index the script under the id `my_script`.
<2> The function score query retrieves the script with id `my_script`.
[[lang-javascript-file]]
[float]
=== File scripts
You can save your scripts to a file in the `config/scripts/` directory on
every node. The `.javascript` file suffix identifies the script as containing
JavaScript:
First, save this file as `config/scripts/my_script.javascript` on every node
in the cluster:
[source,js]
----
doc["num"].value * factor
----
then use the script as follows:
[source,json]
----
DELETE test
PUT test/doc/1
{
"num": 1.0
}
PUT test/doc/2
{
"num": 2.0
}
GET test/_search
{
"query": {
"function_score": {
"script_score": {
"script": {
"file": "my_script", <1>
"lang": "javascript",
"params": {
"factor": 2
}
}
}
}
}
}
----
// AUTOSENSE
<1> The function score query retrieves the script with filename `my_script.javascript`.