267 lines
9.6 KiB
Plaintext
267 lines
9.6 KiB
Plaintext
[[breaking-changes-2.0]]
|
|
== Breaking changes in 2.0
|
|
|
|
This section discusses the changes that you need to be aware of when migrating
|
|
your application to Elasticsearch 2.0.
|
|
|
|
=== Indices API
|
|
|
|
The <<alias-retrieving, get alias api>> will, by default produce an error response
|
|
if a requested index does not exist. This change brings the defaults for this API in
|
|
line with the other Indices APIs. The <<multi-index>> options can be used on a request
|
|
to change this behavior
|
|
|
|
`GetIndexRequest.features()` now returns an array of Feature Enums instead of an array of String values.
|
|
|
|
The following deprecated methods have been removed:
|
|
|
|
* `GetIndexRequest.addFeatures(String[])` - Please use `GetIndexRequest.addFeatures(Feature[])` instead
|
|
* `GetIndexRequest.features(String[])` - Please use `GetIndexRequest.features(Feature[])` instead
|
|
* `GetIndexRequestBuilder.addFeatures(String[])` - Please use `GetIndexRequestBuilder.addFeatures(Feature[])` instead
|
|
* `GetIndexRequestBuilder.setFeatures(String[])` - Please use `GetIndexRequestBuilder.setFeatures(Feature[])` instead
|
|
|
|
=== Partial fields
|
|
|
|
Partial fields were deprecated since 1.0.0beta1 in favor of <<search-request-source-filtering,source filtering>>.
|
|
|
|
=== More Like This Field
|
|
|
|
The More Like This Field query has been removed in favor of the <<query-dsl-mlt-query, More Like This Query>>
|
|
restrained set to a specific `field`.
|
|
|
|
=== Routing
|
|
|
|
The default hash function that is used for routing has been changed from djb2 to
|
|
murmur3. This change should be transparent unless you relied on very specific
|
|
properties of djb2. This will help ensure a better balance of the document counts
|
|
between shards.
|
|
|
|
In addition, the following node settings related to routing have been deprecated:
|
|
|
|
[horizontal]
|
|
|
|
`cluster.routing.operation.hash.type`::
|
|
|
|
This was an undocumented setting that allowed to configure which hash function
|
|
to use for routing. `murmur3` is now enforced on new indices.
|
|
|
|
`cluster.routing.operation.use_type`::
|
|
|
|
This was an undocumented setting that allowed to take the `_type` of the
|
|
document into account when computing its shard (default: `false`). `false` is
|
|
now enforced on new indices.
|
|
|
|
=== Store
|
|
|
|
The `memory` / `ram` store (`index.store.type`) option was removed in Elasticsearch 2.0.
|
|
|
|
=== Term Vectors API
|
|
|
|
Usage of `/_termvector` is deprecated, and replaced in favor of `/_termvectors`.
|
|
|
|
=== Script fields
|
|
|
|
Script fields in 1.x were only returned as a single value. So even if the return
|
|
value of a script used to be list, it would be returned as an array containing
|
|
a single value that is a list too, such as:
|
|
|
|
[source,json]
|
|
---------------
|
|
"fields": {
|
|
"my_field": [
|
|
[
|
|
"v1",
|
|
"v2"
|
|
]
|
|
]
|
|
}
|
|
---------------
|
|
|
|
In elasticsearch 2.x, scripts that return a list of values are considered as
|
|
multivalued fields. So the same example would return the following response,
|
|
with values in a single array.
|
|
|
|
[source,json]
|
|
---------------
|
|
"fields": {
|
|
"my_field": [
|
|
"v1",
|
|
"v2"
|
|
]
|
|
}
|
|
---------------
|
|
|
|
=== Main API
|
|
|
|
Previously, calling `GET /` was giving back the http status code within the json response
|
|
in addition to the actual HTTP status code. We removed `status` field in json response.
|
|
|
|
=== Java API
|
|
|
|
Some query builders have been removed or renamed:
|
|
|
|
* `commonTerms(...)` renamed with `commonTermsQuery(...)`
|
|
* `queryString(...)` renamed with `queryStringQuery(...)`
|
|
* `simpleQueryString(...)` renamed with `simpleQueryStringQuery(...)`
|
|
* `textPhrase(...)` removed
|
|
* `textPhrasePrefix(...)` removed
|
|
* `textPhrasePrefixQuery(...)` removed
|
|
* `filtered(...)` removed. Use `filteredQuery(...)` instead.
|
|
* `inQuery(...)` removed.
|
|
|
|
==== Aggregations
|
|
|
|
The `date_histogram` aggregation now returns a `Histogram` object in the response, and the `DateHistogram` class has been removed. Similarly
|
|
the `date_range`, `ipv4_range`, and `geo_distance` aggregations all return a `Range` object in the response, and the `IPV4Range`, `DateRange`,
|
|
and `GeoDistance` classes have been removed. The motivation for this is to have a single response API for the Range and Histogram aggregations
|
|
regardless of the type of data being queried. To support this some changes were made in the `MultiBucketAggregation` interface which applies
|
|
to all bucket aggregations:
|
|
|
|
* The `getKey()` method now returns `Object` instead of `String`. The actual object type returned depends on the type of aggregation requested
|
|
(e.g. the `date_histogram` will return a `DateTime` object for this method whereas a `histogram` will return a `Number`).
|
|
* A `getKeyAsString()` method has been added to return the String representation of the key.
|
|
* All other `getKeyAsX()` methods have been removed.
|
|
* The `getBucketAsKey(String)` methods have been removed on all aggregations except the `filters` and `terms` aggregations.
|
|
|
|
The `histogram` and the `date_histogram` aggregation now support a simplified `offset` option that replaces the previous `pre_offset` and
|
|
`post_offset` rounding options. Instead of having to specify two separate offset shifts of the underlying buckets, the `offset` option
|
|
moves the bucket boundaries in positive or negative direction depending on its argument.
|
|
|
|
The `date_histogram` options for `pre_zone` and `post_zone` are replaced by the `time_zone` option. The behavior of `time_zone` is
|
|
equivalent to the former `pre_zone` option. Setting `time_zone` to a value like "+01:00" now will lead to the bucket calculations
|
|
being applied in the specified time zone but In addition to this, also the `pre_zone_adjust_large_interval` is removed because we
|
|
now always return dates and bucket keys in UTC.
|
|
|
|
=== Terms filter lookup caching
|
|
|
|
The terms filter lookup mechanism does not support the `cache` option anymore
|
|
and relies on the filesystem cache instead. If the lookup index is not too
|
|
large, it is recommended to make it replicated to all nodes by setting
|
|
`index.auto_expand_replicas: 0-all` in order to remove the network overhead as
|
|
well.
|
|
|
|
=== Parent parameter on update request
|
|
|
|
The `parent` parameter has been removed from the update request. Before 2.x it just set the routing parameter. The
|
|
`routing` setting should be used instead. The `parent` setting was confusing, because it had the impression that the parent
|
|
a child documents points to can be changed but this is not true.
|
|
|
|
==== Delete by query
|
|
|
|
The meaning of the `_shards` headers in the delete by query response has changed. Before version 2.0 the `total`,
|
|
`successful` and `failed` fields in the header are based on the number of primary shards. The failures on replica
|
|
shards aren't being kept track of. From version 2.0 the stats in the `_shards` header are based on all shards
|
|
of an index. The http status code is left unchanged and is only based on failures that occurred while executing on
|
|
primary shards.
|
|
|
|
=== Mappings
|
|
|
|
* The setting `index.mapping.allow_type_wrapper` has been removed. Documents should always be sent without the type as the root element.
|
|
|
|
==== Removed type prefix on field names in queries
|
|
Types can no longer be specified on fields within queries. Instead, specify type restrictions in the search request.
|
|
|
|
The following is an example query in 1.x over types `t1` and `t2`:
|
|
`GET
|
|
[source,sh]
|
|
---------------
|
|
curl -XGET 'localhost:9200/index/_search'
|
|
{
|
|
"query": {
|
|
"bool": {
|
|
"should": [
|
|
{"match": { "t1.field_only_in_t1": "foo" }},
|
|
{"match": { "t2.field_only_in_t2": "bar" }}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
---------------
|
|
|
|
In 2.0, the query should look like the following:
|
|
---------------
|
|
curl -XGET 'localhost:9200/index/t1,t2/_search'
|
|
{
|
|
"query": {
|
|
"bool": {
|
|
"should": [
|
|
{"match": { "field_only_in_t1": "foo" }},
|
|
{"match": { "field_only_in_t2": "bar" }}
|
|
]
|
|
}
|
|
}
|
|
}
|
|
---------------
|
|
|
|
==== Removed short name field access
|
|
Field names in queries, aggregations, etc. must now use the complete name. Use of the short name
|
|
caused ambiguities in field lookups when the same name existed within multiple object mappings.
|
|
|
|
The following example illustrates the difference between 1.x and 2.0.
|
|
|
|
Given these mappings:
|
|
---------------
|
|
curl -XPUT 'localhost:9200/index'
|
|
{
|
|
"mappings": {
|
|
"type": {
|
|
"properties": {
|
|
"name": {
|
|
"type": "object",
|
|
"properties": {
|
|
"first": {"type": "string"},
|
|
"last": {"type": "string"}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
---------------
|
|
|
|
The following query was possible in 1.x:
|
|
---------------
|
|
curl -XGET 'localhost:9200/index/type/_search'
|
|
{
|
|
"query": {
|
|
"match": { "first": "foo" }
|
|
}
|
|
}
|
|
---------------
|
|
|
|
In 2.0, the same query should now be:
|
|
---------------
|
|
curl -XGET 'localhost:9200/index/type/_search'
|
|
{
|
|
"query": {
|
|
"match": { "name.first": "foo" }
|
|
}
|
|
}
|
|
---------------
|
|
|
|
==== Meta fields have limited confiugration
|
|
Meta fields (those beginning with underscore) are fields used by elasticsearch
|
|
to provide special features. They now have limited configuration options.
|
|
|
|
* `_id` configuration can no longer be changed. If you need to sort, use `_uid` instead.
|
|
* `_type` configuration can no longer be changed.
|
|
|
|
=== Codecs
|
|
|
|
It is no longer possible to specify per-field postings and doc values formats
|
|
in the mappings. This setting will be ignored on indices created before
|
|
elasticsearch 2.0 and will cause mapping parsing to fail on indices created on
|
|
or after 2.0. For old indices, this means that new segments will be written
|
|
with the default postings and doc values formats of the current codec.
|
|
|
|
It is still possible to change the whole codec by using the `index.codec`
|
|
setting. Please however note that using a non-default codec is discouraged as
|
|
it could prevent future versions of Elasticsearch from being able to read the
|
|
index.
|
|
|
|
=== Scripts
|
|
|
|
Deprecated script parameters `id`, `file`, and `scriptField` have been removed
|
|
from all scriptable APIs. `script_id`, `script_file` and `script` should be used
|
|
in their place.
|