What is Dynamic Field?

If you cannot confirm the fields for your collection initially, or the fields of your data source may change in the future, you can use pre-defined dynamic fields. You can also define some specified for your data source. Let’s check the C:/{your_installed_path}/solr-5.4.1/server/solr/films/conf/managed-schema.xml , you can some pre-defined dynamic fields with tag “<dynamicField>”, such as:

<dynamicField name=”attr_*” type=”text_general” multiValued=”true” indexed=”true” stored=”true”/>

<dynamicField name=”*_txt” type=”text_general” indexed=”true” stored=”true”/>


Let’s try indexing this article, and see what is happening:


“id”: “/en/02_2016”,

“directed_by”: [“Testing”],

“initial_release_date”: “2016-02-30”,

“genre”: [“Sci”,”Action film”],

“actors”: [“Peter”,”John”],

“attr_testing”: [“dynamic”,”field”,”testing”],

“testing_txt”: “testing movie”,

“name”: “Testing”



Now, try to search this article by using these two fields: http://localhost:8983/solr/films/select?q=testing_txt:testing&wt=json&indent=true  or http://localhost:8983/solr/films/select?q=attr_testing:testing&wt=json&indent=true , it will return you below record.


You may find that this article has a field called “artors”, it is not defined field or dynamic field. So, what will happen to this field? SOLR can dynamically add new field if it is new when indexing a new article, and it will update the schema automatically without restart. You can check again your C:/{your_installed_path}/solr-5.4.1/server/solr/films/conf/managed-schema.xml now, you will find:

<field name=”actors” type=”strings”/>

has been added.

Let’s try searching this article by using “actors” field:

http://localhost:8983/solr/films/select?q=actors:Peter&wt=json&indent=true , it will return you:


SOLR will base on your field data, assigning the related field type to the new field. Please try indexing this article:


“id”: “/en/03_2016”,

“directed_by”: [“Testing3”],

“initial_release_date”: “2016-02-29”,

“genre”: [“Sci”,”Action film”],

“testfield1”: [1,2,3,4,9,15],

“testfield2”: “2016-02-29”,

“testfield3”: [“testing1″,”testing2″,”testing3”],

“name”: “Testing”



and check managed-schema.xml now, you will find that the below fields have been added:

<field name=”testfield1″ type=”tlongs”/>

<field name=”testfield2″ type=”tdates”/>

<field name=”testfield3″ type=”strings”/>


You see… with this feature, you don’t need to worry about the SOLR schema initially.

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