This feature was created for users who want to create an index and prefer JavaScript over C#.
JavaScript indexes can be defined by a user with lower permissions than the C# indexes (admin not required).
All other capabilities and features are the same as C# indexes.
{INFO:Information} This is an experimental feature. You need to enable the featured by adding the following key to your settings.json file:
{CODE-BLOCK:json} { ... "Features.Availability": "Experimental" ... } {CODE-BLOCK/} {INFO/}
If we want to create JavaScript index we need to create an instance of our class that inherits
from AbstractJavaScriptIndexCreationTask.
AbstractJavaScriptIndexCreationTask inherits from AbstractIndexCreationTask
(Read more about AbstractIndexCreationTask here.)
{CODE:java javaScriptindexes_1@Indexes\JavaScript.java /}
Map indexes, sometimes referred to as simple indexes, contain one (or more) mapping functions that indicate which fields from the documents should be indexed.
They indicate which documents can be searched by which fields.
{CODE-BLOCK:java} map(, function (document){ return { // indexed properties go here e.g: // name: document.name }; }) {CODE-BLOCK/}
{CODE:java javaScriptindexes_6@Indexes\JavaScript.java /}
{CODE:java indexes_2@Indexes\JavaScript.java /}
Read more about map indexes here.
Multi-Map indexes allow you to index data from multiple collections
{CODE:java multi_map_5@Indexes\JavaScript.java /}
Read more about multi map indexes here.
Map-Reduce indexes allow you to perform complex aggregations of data. The first stage, called the map, runs over documents and extracts portions of data according to the defined mapping function(s). Upon completion of the first phase, reduction is applied to the map results and the final outcome is produced.
{CODE-BLOCK:java} groupBy(x => {map properties}) .aggregate(y => { return { // indexed properties go here e.g: // name: y.name }; }) {CODE-BLOCK/}
{CODE:java map_reduce_0_0@Indexes\JavaScript.java /}
{CODE:java map_reduce_3_0@Indexes\JavaScript.java /}
Read more about map reduce indexes here.
{INFO:Information} Supported JavaScript version : ECMAScript 5.1 {INFO/}