131 lines
3.8 KiB
Plaintext
131 lines
3.8 KiB
Plaintext
[[breaking_20_crud_and_routing_changes]]
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=== CRUD and routing changes
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==== Explicit custom routing
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Custom `routing` values can no longer be extracted from the document body, but
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must be specified explicitly as part of the query string, or in the metadata
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line in the <<docs-bulk,`bulk`>> API. See <<migration-meta-fields>> for an
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example.
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==== Routing hash function
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The default hash function that is used for routing has been changed from
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`djb2` to `murmur3`. This change should be transparent unless you relied on
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very specific properties of `djb2`. This will help ensure a better balance of
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the document counts between shards.
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In addition, the following routing-related node settings have been deprecated:
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`cluster.routing.operation.hash.type`::
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This was an undocumented setting that allowed to configure which hash function
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to use for routing. `murmur3` is now enforced on new indices.
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`cluster.routing.operation.use_type`::
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This was an undocumented setting that allowed to take the `_type` of the
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document into account when computing its shard (default: `false`). `false` is
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now enforced on new indices.
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==== Delete API with custom routing
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The delete API used to be broadcast to all shards in the index which meant
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that, when using custom routing, the `routing` parameter was optional. Now,
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the delete request is forwarded only to the document holding the shard. If you
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are using custom routing then you should specify the `routing` value when
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deleting a document, just as is already required for the `index`, `create`,
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and `update` APIs.
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To make sure that you never forget a routing value, make routing required with
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the following mapping:
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[source,js]
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---------------------------
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PUT my_index
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{
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"mappings": {
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"my_type": {
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"_routing": {
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"required": true
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}
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}
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}
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}
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---------------------------
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==== All stored meta-fields returned by default
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Previously, meta-fields like `_routing`, `_timestamp`, etc would only be
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included in a GET request if specifically requested with the `fields`
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parameter. Now, all meta-fields which have stored values will be returned by
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default. Additionally, they are now returned at the top level (along with
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`_index`, `_type`, and `_id`) instead of in the `fields` element.
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For instance, the following request:
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[source,sh]
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---------------
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GET /my_index/my_type/1
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---------------
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might return:
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[source,js]
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---------------
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{
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"_index": "my_index",
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"_type": "my_type",
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"_id": "1",
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"_timestamp": 10000000, <1>
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"_source": {
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"foo" : [ "bar" ]
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}
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}
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---------------
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<1> The `_timestamp` is returned by default, and at the top level.
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==== Async replication
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The `replication` parameter has been removed from all CRUD operations
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(`index`, `create`, `update`, `delete`, `bulk`) as it interfered with the
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<<indices-synced-flush,synced flush>> feature. These operations are now
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synchronous only and a request will only return once the changes have been
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replicated to all active shards in the shard group.
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Instead, use more client processes to send more requests in parallel.
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==== Documents must be specified without a type wrapper
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Previously, the document body could be wrapped in another object with the name
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of the `type`:
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[source,js]
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--------------------------
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PUT my_index/my_type/1
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{
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"my_type": { <1>
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"text": "quick brown fox"
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}
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}
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--------------------------
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<1> This `my_type` wrapper is not part of the document itself, but represents the document type.
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This feature was deprecated before but could be reenabled with the
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`mapping.allow_type_wrapper` index setting. This setting is no longer
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supported. The above document should be indexed as follows:
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[source,js]
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--------------------------
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PUT my_index/my_type/1
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{
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"text": "quick brown fox"
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}
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--------------------------
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==== Term Vectors API
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Usage of `/_termvector` is deprecated in favor of `/_termvectors`.
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