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Standard Analyzer

The standard analyzer is the default for all Atlas Search indexes and queries. It divides text into terms based on word boundaries, which makes it language-neutral for most use cases. It converts all terms to lower case and removes punctuation. It provides grammar-based tokenization that recognizes email addresses, acronyms, Chinese-Japanese-Korean characters, alphanumerics, and more.

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

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

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": "Ready for planning." }

The following query uses the index on the summary field:

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

The above query returns the following results:

{ "_id" : 1, "summary" : "No action required at this time." }
{ "_id" : 2, "summary" : "Case set aside for future action." }
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