2013-12-12 14:09:32 -05:00
|
|
|
[[query-dsl-simple-query-string-query]]
|
|
|
|
=== Simple Query String Query
|
|
|
|
|
|
|
|
A query that uses the SimpleQueryParser to parse its context. Unlike the
|
|
|
|
regular `query_string` query, the `simple_query_string` query will never
|
|
|
|
throw an exception, and discards invalid parts of the query. Here is
|
|
|
|
an example:
|
|
|
|
|
|
|
|
[source,js]
|
|
|
|
--------------------------------------------------
|
|
|
|
{
|
|
|
|
"simple_query_string" : {
|
|
|
|
"query": "\"fried eggs\" +(eggplant | potato) -frittata",
|
|
|
|
"analyzer": "snowball",
|
|
|
|
"fields": ["body^5","_all"],
|
|
|
|
"default_operator": "and"
|
|
|
|
}
|
|
|
|
}
|
|
|
|
--------------------------------------------------
|
|
|
|
|
|
|
|
The `simple_query_string` top level parameters include:
|
|
|
|
|
|
|
|
[cols="<,<",options="header",]
|
|
|
|
|=======================================================================
|
|
|
|
|Parameter |Description
|
|
|
|
|`query` |The actual query to be parsed. See below for syntax.
|
|
|
|
|
|
|
|
|`fields` |The fields to perform the parsed query against. Defaults to the
|
|
|
|
`index.query.default_field` index settings, which in turn defaults to `_all`.
|
|
|
|
|
|
|
|
|`default_operator` |The default operator used if no explicit operator
|
|
|
|
is specified. For example, with a default operator of `OR`, the query
|
|
|
|
`capital of Hungary` is translated to `capital OR of OR Hungary`, and
|
|
|
|
with default operator of `AND`, the same query is translated to
|
|
|
|
`capital AND of AND Hungary`. The default value is `OR`.
|
|
|
|
|
|
|
|
|`analyzer` |The analyzer used to analyze each term of the query when
|
|
|
|
creating composite queries.
|
2013-12-27 11:54:06 -05:00
|
|
|
|
|
|
|
|`flags` |Flags specifying which features of the `simple_query_string` to
|
|
|
|
enable. Defaults to `ALL`.
|
2013-12-12 14:09:32 -05:00
|
|
|
|=======================================================================
|
|
|
|
|
|
|
|
[float]
|
|
|
|
==== Simple Query String Syntax
|
|
|
|
The `simple_query_string` supports the following special characters:
|
|
|
|
|
|
|
|
* `+` signifies AND operation
|
|
|
|
* `|` signifies OR operation
|
|
|
|
* `-` negates a single token
|
|
|
|
* `"` wraps a number of tokens to signify a phrase for searching
|
|
|
|
* `*` at the end of a term signifies a prefix query
|
|
|
|
* `(` and `)` signify precedence
|
|
|
|
|
|
|
|
In order to search for any of these special characters, they will need to
|
|
|
|
be escaped with `\`.
|
|
|
|
|
|
|
|
[float]
|
|
|
|
==== Default Field
|
|
|
|
When not explicitly specifying the field to search on in the query
|
|
|
|
string syntax, the `index.query.default_field` will be used to derive
|
|
|
|
which field to search on. It defaults to `_all` field.
|
|
|
|
|
|
|
|
So, if `_all` field is disabled, it might make sense to change it to set
|
|
|
|
a different default field.
|
|
|
|
|
|
|
|
[float]
|
|
|
|
==== Multi Field
|
|
|
|
The fields parameter can also include pattern based field names,
|
|
|
|
allowing to automatically expand to the relevant fields (dynamically
|
|
|
|
introduced fields included). For example:
|
|
|
|
|
|
|
|
[source,js]
|
|
|
|
--------------------------------------------------
|
|
|
|
{
|
|
|
|
"simple_query_string" : {
|
|
|
|
"fields" : ["content", "name.*^5"],
|
|
|
|
"query" : "foo bar baz"
|
|
|
|
}
|
|
|
|
}
|
|
|
|
--------------------------------------------------
|
2013-12-27 11:54:06 -05:00
|
|
|
|
|
|
|
[float]
|
|
|
|
==== Flags
|
|
|
|
`simple_query_string` support multiple flags to specify which parsing features
|
|
|
|
should be enabled. It is specified as a `|`-delimited string with the
|
|
|
|
`flags` parameter:
|
|
|
|
|
|
|
|
[source,js]
|
|
|
|
--------------------------------------------------
|
|
|
|
{
|
|
|
|
"simple_query_string" : {
|
|
|
|
"query" : "foo | bar & baz*",
|
|
|
|
"flags" : "OR|AND|PREFIX"
|
|
|
|
}
|
|
|
|
}
|
|
|
|
--------------------------------------------------
|
|
|
|
|
|
|
|
The available flags are: `ALL`, `NONE`, `AND`, `OR`, `PREFIX`, `PHRASE`,
|
|
|
|
`PRECEDENCE`, `ESCAPE`, and `WHITESPACE`.
|