Whitespace Analyzer¶

The whitespace analyzer divides text into searchable terms wherever it finds a whitespace character. It leaves all terms in their original case.

Example¶

The following example index definition specifies an index on the summary field using the whitespace analyzer:

{
  "mappings": {
    "fields": {
      "summary": {
        "type": "string",
        "analyzer": "lucene.whitespace"
      }
    }
  }
}

Consider a collection named cases with the following documents:

{ "_id": 1, "summary": "No action required at this time." }
{ "_id": 2, "summary": "Case set aside for future action." }
{ "_id": 3, "summary": "Frank's case is ready for planning." }

The following query uses the index on the summary field:

db.cases.aggregate([
  {
     $search: {
       "text": {
         "query":  "Frank's",
         "path": "summary"
        }
     }
  }
])

The above query returns the following result:

{ "_id" : 3, "summary" : "Frank's case is ready for planning." }

The index is case-sensitive.

db.cases.aggregate([
  {
     $search: {
       "text": {
         "query": "Case",
         "path": "summary"
        }
     }
  }
])

The above query returns the following result:

{ "_id" : 2, "summary" : "Case set aside for future action." }

The document with _id: 3 is not included, because it has the lower-case string case and the search term is Case.

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