copyField makes it so that all the data coming into the source will be copied over to dest , before analysis happens. This allows for us to index and query a field in multiple ways, e.g.:

<field name="name" type="text_general" indexed="true" stored="true" />
<field name="name_exact" type="string" indexed="true" stored="false" />

<copyField source="name" dest="name_exact" />

Here the document only stores the field name but we can also query using the field name_exact, which will only match the entire names.

IMPORTANT: If dest either takes multiple values from source , or is copied to from many sources, remember to set multiValued to "true" on the dest field.

document

basic unit of information; consists of fields

doc-values

way of recording field values that is more efficient for some purposes, e.g. faceting and sorting

faceting

the arrangement of search results into categories based on indexed terms. Searchers are presented with the indexed terms, along with numerical counts of how many matching documents were found were each term.

(no term)