OpenSearch/docs/reference/migration/migrate_2_0/removals.asciidoc

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[[breaking_20_removed_features]]
=== Removed features
==== Rivers have been removed
Elasticsearch does not support rivers anymore. While we had first planned to
keep them around to ease migration, keeping support for rivers proved to be
challenging as it conflicted with other important changes that we wanted to
bring to 2.0 like synchronous dynamic mappings updates, so we eventually
decided to remove them entirely. See
link:/blog/deprecating_rivers[Deprecating Rivers] for more background about
why we took this decision.
==== Facets have been removed
Facets, deprecated since 1.0, have now been removed. Instead, use the much
more powerful and flexible <<search-aggregations,aggregations>> framework.
This also means that Kibana 3 will not work with Elasticsearch 2.0.
==== MVEL has been removed
The MVEL scripting language has been removed. The default scripting language
is now Groovy.
==== Delete-by-query is now a plugin
The old delete-by-query functionality was fast but unsafe. It could lead to
document differences between the primary and replica shards, and could even
produce out of memory exceptions and cause the cluster to crash.
This feature has been reimplemented using the <<search-request-scroll,scroll>> and
<<docs-bulk,`bulk`>> APIs, which may be slower for queries which match
large numbers of documents, but is safe.
Currently, a long running delete-by-query job cannot be cancelled, which is
one of the reasons that this functionality is only available as a plugin. You
can install the plugin with:
[source,sh]
------------------
./bin/elasticsearch-plugin install delete-by-query
------------------
See {plugins}/plugins-delete-by-query.html for more information.
==== Multicast Discovery is now a plugin
Support for multicast is very patchy. Linux doesnt allow multicast listening on localhost,
while OS/X sends multicast broadcasts across all interfaces regardless of the configured
bind address. On top of that, some networks have multicast disabled by default.
This feature has been moved to a plugin. The default discovery mechanism now uses
unicast, with a default setup which looks for the first 5 ports on localhost. If you
still need to use multicast discovery, you can install the plugin with:
[source,sh]
------------------
./bin/elasticsearch-plugin install discovery-multicast
------------------
==== `_shutdown` API
The `_shutdown` API has been removed without a replacement. Nodes should be
managed via the operating system and the provided start/stop scripts.
==== `murmur3` is now a plugin
The `murmur3` field, which indexes hashes of the field values, has been moved
out of core and is available as a plugin. It can be installed as:
[source,sh]
------------------
./bin/elasticsearch-plugin install mapper-murmur3
------------------
==== `_size` is now a plugin
The `_size` meta-data field, which indexes the size in bytes of the original
JSON document, has been moved out of core and is available as a plugin. It
can be installed as:
[source,sh]
------------------
./bin/elasticsearch-plugin install mapper-size
------------------
==== Thrift and memcached transport
The thrift and memcached transport plugins are no longer supported. Instead, use
either the HTTP transport (enabled by default) or the node or transport Java client.
==== Bulk UDP
The bulk UDP API has been removed. Instead, use the standard
<<docs-bulk,`bulk`>> API, or use UDP to send documents to Logstash first.
==== MergeScheduler pluggability
The merge scheduler is no longer pluggable.