The kununu way of writing Elasticsearch queries :)
This class provides a fluent interface with a syntax inspired by groovy. Currently, the most important Elasticsearch queries and aggregations are available:
- Full text queries:
- Compound queries:
- Term-level queries:
- Geo queries:
- Nested queries:
- Aggregations:
Query drastically simplifies the way queries are built by differentiating between two types of criteria:
- filter (corresponds with Term-level queries)
- search (corresponds with Full text queries)
Within those two groups, all instances have the same interface. For instance, the syntax for writing a Terms query is
the same as for writing a GeoShape query; QueryStringQuery works the same as a MatchQuery, etc.
Example:
$nestedBoolQuery = Query::create(
Should::create(
Filter::create('something', false, Operator::EXISTS),
Filter::create('something', 0)
),
Must::create(
Filter::create('something_else', 10, Operator::GREATER_THAN),
Filter::create('something_else', 20, Operator::LESS_THAN_EQUALS)
),
Filter::create('field', ['value1', 'value2'], Operator::TERMS),
Aggregation::create('field', Metric::SUM, 'my_aggregation')
);When querying for documents Elasticsearch differentiates two contexts:
- filter context: does not contribute to the score of matching documents
- query context: does indeed contribute to the score
When using the factory method (Query::create()) to build a query, all Search objects will be put into the query
context, while all Filter objects (this includes all bool queries Must, Should and MustNot!) will be put in the
filter context.
This should support the vast majority of use-cases while keeping query creation simple.
For use-cases which require more advanced boolean combination of Search objects it's possible to use
the Query::search() method. This method accepts objects of type SearchInterface as well as BoolQueryInterface.
See examples below.
All implementations of QueryInterface share some basic common functionality:
- Pagination
- Sorting
- Source filtering
Method names are inspired by SQL to reduce learning time.
Example:
$query = Query::create()
->limit(10) // this query will retrieve not more than 10 documents
->skip(1) // skip the first matching document
->sort('field_a', SortDirection::DESC) // primarily, sort results by field_a descending
->sort('field_b', SortDirection::ASC) // secondary, sort results by field_b ascending
->select(['field_a', 'field_b']); // for all matching documents retrieve only field_a and field_b (from the _source)Will produce
{
"size": 10,
"from": 1,
"sort" : [
{ "field_a" : { "order": "desc" } },
{ "field_b" : { "order": "asc" } }
],
"_source": [ "field_a", "field_b" ]
}Advanced sorting:
The third parameter of the sort() method allows for injecting any of the advanced optional sorting parameters that
Elasticsearch offers. This $options array will be taken as-is and merged with the internal sorting data-structure,
therefore making the by-default simple syntax easily extensible for advanced use-cases.
Query::create()
->sort('field', SortDirection::DESC, ['mode' => 'avg', 'missing' => '_last']);Will produce
{
"sort" : [
{ "field" : {"order": "desc", "mode": "avg", "missing" : "_last"} }
]
}To add one or more filters or searches to a query, simply pass them as separate arguments when creating the query or add them anytime later by calling Query::filter() or Query::search(), respectively.
Per default all filters are combined with a boolean AND (i.e. Elasticsearch must).
Query::create(
Filter::create('field', ['value1', 'value2'], Operator::TERMS)
);Will produce
{
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"terms": {
"field": [
"value1",
"value2"
]
}
}
]
}
}
}
}
}Per default all searches are combined with a boolean OR (i.e. Elasticsearch should) with at least 1 matching.
Query::create(
Search::create(['field'], 'my query', Search::MATCH)
);Will produce
{
"query": {
"bool": {
"should": [
{
"match": {
"field": {
"query": "my query"
}
}
}
],
"minimum_should_match": 1
}
}
}Overriding the default behavior to force two fulltext-searches which both have to match:
$query = Query::create(
Search::create(['field_a'], 'my query', Search::MATCH)
Search::create(['field_b', 'field_c'], 'my query', Search::QUERY_STRING)
);
$query->setSearchOperator(Must::OPERATOR);Will produce
{
"query": {
"bool": {
"must": [
{
"match": {
"field_a": {
"query": "my query"
}
}
},
{
"query_string": {
"fields": [
"field_b",
"field_c"
],
"query": "my query"
}
}
]
}
}
}Note that the Search will contribute to the document score while the Filter won't.
Query::create(
Filter::create('field_x', ['value1', 'value2'], Operator::TERMS),
Search::create(['field_a'], 'my query', Search::MATCH)
);Will produce
{
"query": {
"bool": {
"must": [
{
"match": {
"field_a": {
"query": "my query"
}
}
}
],
"filter": {
"bool": {
"must": [
{
"terms": {
"field_x": [
"value1",
"value2"
]
}
}
]
}
}
}
}
}Query::create(
Should::create(
Filter::create('something', false, Operator::EXISTS),
Filter::create('something', 0)
),
Must::create(
Filter::create('something_else', 10, Operator::GREATER_THAN),
Filter::create('something_else', 20, Operator::LESS_THAN_EQUALS)
),
Filter::create('field', ['value1', 'value2'], Operator::TERMS),
);Will produce
{
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"bool": {
"should": [
{
"bool": {
"must_not": [
{
"exists": {
"field": "something"
}
}
]
}
},
{
"term": {
"something": 0
}
}
]
}
},
{
"bool": {
"must": [
{
"range": {
"something_else": {
"gt": 10
}
}
},
{
"range": {
"something_else": {
"lte": 20
}
}
}
]
}
},
{
"terms": {
"field": [
"value1",
"value2"
]
}
}
]
}
}
}
}
}Note that the Searches will contribute to the document score while the Filter won't.
$query = Query::create(Filter::create('field', 'value'))
->search(
Should::create(
Search::create(['field_a'], 'foo', Search::QUERY_STRING, ['boost' => 4]),
Search::create(['field_a'], 'foo', Search::MATCH, ['boost' => 10])
)
)
->search(
Should::create(
Search::create(['field_b'], 'foo', Search::QUERY_STRING, ['boost' => 2]),
Search::create(['field_b'], 'foo', Search::MATCH, ['boost' => 5])
)
)
->setSearchOperator(Must::OPERATOR)
->setMinScore(42);Will produce
{
"query": {
"bool": {
"must": [
{
"bool": {
"should": [
{
"query_string": {
"boost": 4,
"fields": [
"field_a"
],
"query": "foo"
}
},
{
"match": {
"field_a": {
"boost": 10,
"query": "foo"
}
}
}
]
}
},
{
"bool": {
"should": [
{
"query_string": {
"boost": 2,
"fields": [
"field_b"
],
"query": "foo"
}
},
{
"match": {
"field_b": {
"boost": 5,
"query": "foo"
}
}
}
]
}
}
],
"filter": {
"bool": {
"must": [
{
"term": {
"field": "value"
}
}
]
}
}
}
},
"min_score": 42
}Some Elasticsearch full-text queries ( f.e. Query String Query) can operate on multiple fields. It's possible to boost separate fields individually.
$query = Query::create(
Search::create(['field_a' => ['boost' => 2], 'field_b'], 'my query', Search::QUERY_STRING)
);Will produce
{
"query": {
"bool": {
"should": [
{
"query_string": {
"fields": [
"field_a^2",
"field_b"
],
"query": "my query"
}
}
],
"minimum_should_match": 1
}
}
}Query::create()
->select(['a', 'b])
->search(Search::create(['field_a'], 'my query', Search::MATCH))
->where(Filter::create('field_x', ['value1', 'value2'], Operator::TERMS))
->sort('a', SortDirection::DESC')
->limit(10)
->skip(100);
);Nested queries can be used to search/filter within nested fields. The nested query searches nested field objects as if they were indexed as separate documents. If an object matches the search, the nested query returns the root parent document. For more information see the Elasticsearch documentation .
To create a nested query, simply use the Query::createNested() factory method. Pass the path of the nested field as
first argument and an arbitrary number of Filters/Searches after that.
Examples:
In the first example a query is nested inside the filter context. This is the default behavior when passing a nested
query to the Query::create() factory method.
Query::create(
Query::createNested('my_field', Filter::create('my_field.subfield', 'foobar'))
);Will produce
{
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"nested": {
"path": "my_field",
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"term": {
"my_field.subfield": "foobar"
}
}
]
}
}
}
}
}
}
]
}
}
}
}
}However, queries can also be nested inside the search context:
Query::create()
->search(Query::createNested('my_field', Filter::create('my_field.subfield', 'foobar')));Will produce
{
"query": {
"bool": {
"should": [
{
"nested": {
"path": "my_field",
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"term": {
"my_field.subfield": "foobar"
}
}
]
}
}
}
}
}
}
],
"minimum_should_match": 1
}
}
}Also, any combination of boolean and nested queries is possible.
Optional options can be set by calling setOption() on the nested query:
Query::create(
Query::createNested('my_field', Filter::create('my_field.subfield', 'foobar'))
->setOption(NestableQueryInterface::OPTION_SCORE_MODE, 'max')
->setOption(NestableQueryInterface::OPTION_IGNORE_UNMAPPED, true)
);Will produce
{
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"nested": {
"path": "my_field",
"score_mode": "max",
"ignore_unmapped": true,
"query": {
"bool": {
"filter": {
"bool": {
"must": [
{
"term": {
"my_field.subfield": "foobar"
}
}
]
}
}
}
}
}
}
]
}
}
}
}
}To add one or more aggregation(s) to a query, simply pass them as separate arguments when creating the query or add them anytime later by calling Query::aggregate().
All aggregations implemented in this package work the same way, therefore simplifying things a lot:
Aggregation::create('fieldname', Metric::AVG, 'my_aggregation')Will produce
{
"aggs": {
"my_aggregation": {
"avg": {
"field": "fieldname"
}
}
}
}The fourth parameter of the Aggregation::create() method allows for injecting any of the advanced optional aggregation parameters that Elasticsearch offers.
This $options array will be taken as-is and merged with the internal aggregation data-structure, therefore making the by-default simple syntax easily extensible for advanced use-cases.
For example:
Aggregation::create('fieldname', Metric::GEO_BOUNDS, 'viewport', ['wrap_longitude' => true])Will produce
{
"aggs": {
"viewport": {
"geo_bounds": {
"field": "fieldname",
"wrap_longitude": true
}
}
}
}Please find all available aggregation types in Query\Aggregation\Metric and Query\Aggregation\Bucket, respectively.
Usually aggregations operate on a field. However, there are a few exceptions to this rule, for
example Filters Aggregation
. Use the Aggregation::createFieldless() factory method to create an aggregation which is not bound to a specific
field.
For example:
Aggregation::createFieldless(
Bucket::FILTERS,
'my_buckets',
[
'other_bucket_key' => 'everything_else',
'filters' => ['bucket_a' => ['term' => ['field' => 'field_a']]]
]
);Will produce
{
"aggs": {
"my_buckets": {
"filters": {
"other_bucket_key": "everything_else",
"filters": {
"bucket_a": {
"term": {
"field": "field_a"
}
}
}
}
}
}
}Global aggregations work as defined here .
To create a global aggregation simply use the dedicated factory method and nest other aggregations within, just as usual.
For example:
Aggregation::createGlobal('all_products')
->nest(Aggregation::create('price', Metric::AVG, 'avg_price'));