What is the use of “multiValued” field type in Solr?

Question

I\'m new to Apache Solr. Even after reading the documentation part, I\'m finding it difficult to clearly understand the functionality and use of the multiValued

Answer 1

multiValued defined in the schema whether the field is allowed to have more than one value.

For instance:
if I have a fieldType called ID which is multiValued=false indexing a document such as this:

doc {
  id : [ 1, 2]
  ...
}

would cause an exception to be thrown in the indexing thread and the document will not be indexed (schema validation will fail).

On the other hand if I do have multiple values for a field I would want to set multiValued=true in order to guarantee that indexing is done correctly, for example:

doc {
  id : 1
  keywords: [ hello, world ]
  ...
}

In this case you would define "keywords" as a multiValued field.