OpenSearch/docs/reference/mapping/fields/source-field.asciidoc

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[[mapping-source-field]]
=== `_source`
The `_source` field is an automatically generated field that stores the
actual JSON that was used as the indexed document. It is not indexed
(searchable), just stored. When executing "fetch" requests, like
<<docs-get,get>> or
<<search-search,search>>, the `_source` field is
returned by default.
Though very handy to have around, the source field does incur storage
overhead within the index. For this reason, it can be disabled. For
example:
[source,js]
--------------------------------------------------
{
"tweet" : {
"_source" : {"enabled" : false}
}
}
--------------------------------------------------
[float]
==== Includes / Excludes
Allow to specify paths in the source that would be included / excluded
when it's stored, supporting `*` as wildcard annotation. For example:
[source,js]
--------------------------------------------------
{
"my_type" : {
"_source" : {
"includes" : ["path1.*", "path2.*"],
"excludes" : ["pat3.*"]
}
}
}
--------------------------------------------------