Arrays
editArrays
editIn Elasticsearch, there is no dedicated array
data type. Any field can contain
zero or more values by default, however, all values in the array must be of the
same data type. For instance:
-
an array of strings: [
"one"
,"two"
] -
an array of integers: [
1
,2
] -
an array of arrays: [
1
, [2
,3
]] which is the equivalent of [1
,2
,3
] -
an array of objects: [
{ "name": "Mary", "age": 12 }
,{ "name": "John", "age": 10 }
]
When adding a field dynamically, the first value in the array determines the
field type
. All subsequent values must be of the same data type or it must
at least be possible to coerce subsequent values to the same
data type.
Arrays with a mixture of data types are not supported: [ 10
, "some string"
]
An array may contain null
values, which are either replaced by the
configured null_value
or skipped entirely. An empty array
[]
is treated as a missing field — a field with no values.
Nothing needs to be pre-configured in order to use arrays in documents, they are supported out of the box:
response = client.index( index: 'my-index-000001', id: 1, body: { message: 'some arrays in this document...', tags: [ 'elasticsearch', 'wow' ], lists: [ { name: 'prog_list', description: 'programming list' }, { name: 'cool_list', description: 'cool stuff list' } ] } ) puts response response = client.index( index: 'my-index-000001', id: 2, body: { message: 'no arrays in this document...', tags: 'elasticsearch', lists: { name: 'prog_list', description: 'programming list' } } ) puts response response = client.index( index: 'my-index-000001', body: { query: { match: { tags: 'elasticsearch' } } } ) puts response
{ res, err := es.Index( "my-index-000001", strings.NewReader(`{ "message": "some arrays in this document...", "tags": [ "elasticsearch", "wow" ], "lists": [ { "name": "prog_list", "description": "programming list" }, { "name": "cool_list", "description": "cool stuff list" } ] }`), es.Index.WithDocumentID("1"), es.Index.WithPretty(), ) fmt.Println(res, err) } { res, err := es.Index( "my-index-000001", strings.NewReader(`{ "message": "no arrays in this document...", "tags": "elasticsearch", "lists": { "name": "prog_list", "description": "programming list" } }`), es.Index.WithDocumentID("2"), es.Index.WithPretty(), ) fmt.Println(res, err) } { res, err := es.Search( es.Search.WithIndex("my-index-000001"), es.Search.WithBody(strings.NewReader(`{ "query": { "match": { "tags": "elasticsearch" } } }`)), es.Search.WithPretty(), ) fmt.Println(res, err) }
PUT my-index-000001/_doc/1 { "message": "some arrays in this document...", "tags": [ "elasticsearch", "wow" ], "lists": [ { "name": "prog_list", "description": "programming list" }, { "name": "cool_list", "description": "cool stuff list" } ] } PUT my-index-000001/_doc/2 { "message": "no arrays in this document...", "tags": "elasticsearch", "lists": { "name": "prog_list", "description": "programming list" } } GET my-index-000001/_search { "query": { "match": { "tags": "elasticsearch" } } }