OpenSearch/docs/reference/migration/migrate_3_0.asciidoc

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[[breaking-changes-3.0]]
== Breaking changes in 3.0
This section discusses the changes that you need to be aware of when migrating
your application to Elasticsearch 3.0.
=== Search changes
==== `search_type=count` removed
The `count` search type was deprecated since version 2.0.0 and is now removed.
In order to get the same benefits, you just need to set the value of the `size`
parameter to `0`.
For instance, the following request:
[source,sh]
---------------
GET /my_index/_search?search_type=count
{
"aggs": {
"my_terms": {
"terms": {
"field": "foo"
}
}
}
}
---------------
can be replaced with:
[source,sh]
---------------
GET /my_index/_search
{
"size": 0,
"aggs": {
"my_terms": {
"terms": {
"field": "foo"
}
}
}
}
---------------
==== `search_type=scan` removed
The `scan` search type was deprecated since version 2.1.0 and is now removed.
All benefits from this search type can now be achieved by doing a scroll
request that sorts documents in `_doc` order, for instance:
[source,sh]
---------------
GET /my_index/_search?scroll=2m
{
"sort": [
"_doc"
]
}
---------------
Scroll requests sorted by `_doc` have been optimized to more efficiently resume
from where the previous request stopped, so this will have the same performance
characteristics as the former `scan` search type.