basic text indexing and search

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    • Type: New Feature
    • Resolution: Done
    • Priority: Major - P3
    • 2.3.2
    • Affects Version/s: None
    • Component/s: Index Maintenance, Querying
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    • Fully Compatible
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      Simple text indexing.
      Initial version will be marked as experimental, so has to be turned on with a command line flag or at runtime.

      db.adminCommand( { setParameter : "*", textSearchEnabled : true } );

      OR

      ./mongod --setParameter textSearchEnabled=true

      Only works via "text" command currently.

      Features:

      • parsing + stemming for latin languages
      • multi-word scoring
      • phrase matching
      • word negation
      • weights per field
      • additional suffix index fields for coverings
      • additional prefix index fields for partitioning
      • specify language per document

      Simple Example:

      > db.foo.insert( { _id: 1 , desc: "the dog is running" } )
> db.foo.insert( { _id: 2 , desc: "the cat is walking" } )
> db.foo.ensureIndex( { "desc": "text" } )
> db.foo.runCommand( "text", { search : "walk" } )
{
	"queryDebugString" : "walk||||||",
	"language" : "english",
	"results" : [
		{
			"score" : 0.75,
			"obj" : {
				"_id" : 2,
				"desc" : "the cat is walking"
			}
		}
	],
	"stats" : {
		"nscanned" : 1,
		"nscannedObjects" : 0,
		"n" : 1,
		"timeMicros" : 330
	},
	"ok" : 1
}