Class IndexDefinition

Schema for a full text search analyzer.

Schema for the text index default field configuration. The default field is used to index the text of all fields within a document for use with the $text operator.

List of field objects to index. Nested fields are also allowed, e.g. person.name.

For "json" type indexes each object is a mapping of field name to sort direction (asc or desc).

For "text" type indexes each object has a name property of the field name and a type property of the field type (string, number, or boolean).

Whether to scan every document for arrays and store the length for each array found. Set the index_array_lengths field to false if:

• You do not need to know the length of an array. * You do not use the $size operator. * The documents in your database are complex, or not completely under your control. As a result, it is difficult to estimate the impact of the extra processing that is needed to determine and store the arrays lengths.

JSON object describing criteria used to select documents. The selector specifies fields in the document, and provides an expression to evaluate with the field content or other data.

The selector object must:

• Be structured as valid JSON.
• Contain a valid query expression.

Using a selector is significantly more efficient than using a JavaScript filter function, and is the recommended option if filtering on document attributes only.

Elementary selector syntax requires you to specify one or more fields, and the corresponding values required for those fields. You can create more complex selector expressions by combining operators.

Operators are identified by the use of a dollar sign $ prefix in the name field.

There are two core types of operators in the selector syntax:

• Combination operators: applied at the topmost level of selection. They are used to combine selectors. A combination operator takes a single argument. The argument is either another selector, or an array of selectors.
• Condition operators: are specific to a field, and are used to evaluate the value stored in that field. For instance, the basic $eq operator matches when the specified field contains a value that is equal to the supplied argument.

It is important for query performance to use appropriate selectors:

• Only equality operators such as $eq, $gt, $gte, $lt, and $lte (but not $ne) can be used as the basis of a query. You should include at least one of these in a selector.
• Some operators such as $not, $or, $in, and $regex cannot be answered from an index. For query selectors use these operators in conjunction with equality operators or create and use a partial index to reduce the number of documents that will need to be scanned.

See the Cloudant Docsfor a list of all available combination and conditional operators.

For further reference see selector syntax.