Breaking changes in 1.4

This section discusses the changes that you need to be aware of when migrating your application from Elasticsearch 1.x to Elasticsearch 1.4.

In indices created with version 1.4.0 or later, percolation queries can only refer to fields that already exist in the mappings in that index. There are two ways to make sure that a field mapping exist:

Aliases can include filters which are automatically applied to any search performed via the alias. Filtered aliases created with version 1.4.0 or later can only refer to field names which exist in the mappings of the index (or indices) pointed to by the alias.

Add or update a mapping via the create index or put mapping apis.

The get warmer api will return a section for warmers even if there are no warmers. This ensures that the following two examples are equivalent:

curl -XGET 'http://localhost:9200/_all/_warmers'

curl -XGET 'http://localhost:9200/_warmers'

The get alias api will return a section for aliases even if there are no aliases. This ensures that the following two examples are equivalent:

curl -XGET 'http://localhost:9200/_all/_aliases'

curl -XGET 'http://localhost:9200/_aliases'

The get mapping api will return a section for mappings even if there are no mappings. This ensures that the following two examples are equivalent:

curl -XGET 'http://localhost:9200/_all/_mappings'

curl -XGET 'http://localhost:9200/_mappings'

Bulk UDP has been deprecated and will be removed in 2.0. You should use the standard bulk API instead. Each cluster must have an elected master node in order to be fully operational. Once a node loses its elected master node it will reject some or all operations.

On versions before 1.4.0.Beta1 all operations are rejected when a node loses its elected master. From 1.4.0.Beta1 only write operations will be rejected by default. Read operations will still be served based on the information available to the node, which may result in being partial and possibly also stale. If the default is undesired then the pre 1.4.0.Beta1 behaviour can be enabled, see: no-master-block

The More Like This Field query has been deprecated in favor of the More Like This Query restrained set to a specific field. It will be removed in 2.0.

Groovy is the new default scripting language in Elasticsearch, and is enabled in sandbox mode by default. MVEL has been removed from core, but is available as a plugin: https://github.com/elasticsearch/elasticsearch-lang-mvel