197 lines
8.5 KiB
Plaintext
197 lines
8.5 KiB
Plaintext
--
|
||
:api: reindex
|
||
:request: ReindexRequest
|
||
:response: BulkByScrollResponse
|
||
--
|
||
|
||
[id="{upid}-{api}"]
|
||
=== Reindex API
|
||
|
||
[id="{upid}-{api}-request"]
|
||
==== Reindex Request
|
||
|
||
A +{request}+ can be used to copy documents from one or more indexes into a
|
||
destination index.
|
||
|
||
It requires an existing source index and a target index which may or may not exist pre-request. Reindex does not attempt
|
||
to set up the destination index. It does not copy the settings of the source index. You should set up the destination
|
||
index prior to running a _reindex action, including setting up mappings, shard counts, replicas, etc.
|
||
|
||
The simplest form of a +{request}+ looks like this:
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request]
|
||
--------------------------------------------------
|
||
<1> Creates the +{request}+
|
||
<2> Adds a list of sources to copy from
|
||
<3> Adds the destination index
|
||
|
||
The `dest` element can be configured like the index API to control optimistic concurrency control. Just leaving out
|
||
`versionType` (as above) or setting it to internal will cause Elasticsearch to blindly dump documents into the target.
|
||
Setting `versionType` to external will cause Elasticsearch to preserve the version from the source, create any documents
|
||
that are missing, and update any documents that have an older version in the destination index than they do in the
|
||
source index.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-versionType]
|
||
--------------------------------------------------
|
||
<1> Set the versionType to `EXTERNAL`
|
||
|
||
Setting `opType` to `create` will cause `_reindex` to only create missing documents in the target index. All existing
|
||
documents will cause a version conflict. The default `opType` is `index`.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-opType]
|
||
--------------------------------------------------
|
||
<1> Set the opType to `create`
|
||
|
||
By default version conflicts abort the `_reindex` process but you can just count
|
||
them instead with:
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-conflicts]
|
||
--------------------------------------------------
|
||
<1> Set `proceed` on version conflict
|
||
|
||
You can limit the documents by adding a query.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-query]
|
||
--------------------------------------------------
|
||
<1> Only copy documents which have field `user` set to `kimchy`
|
||
|
||
It’s also possible to limit the number of processed documents by setting size.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-size]
|
||
--------------------------------------------------
|
||
<1> Only copy 10 documents
|
||
|
||
By default `_reindex` uses batches of 1000. You can change the batch size with `sourceBatchSize`.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-sourceSize]
|
||
--------------------------------------------------
|
||
<1> Use batches of 100 documents
|
||
|
||
Reindex can also use the ingest feature by specifying a `pipeline`.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-pipeline]
|
||
--------------------------------------------------
|
||
<1> set pipeline to `my_pipeline`
|
||
|
||
If you want a particular set of documents from the source index you’ll need to use sort. If possible, prefer a more
|
||
selective query to size and sort.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-sort]
|
||
--------------------------------------------------
|
||
<1> add descending sort to`field1`
|
||
<2> add ascending sort to `field2`
|
||
|
||
+{request}+ also supports a `script` that modifies the document. It allows you to
|
||
also change the document's metadata. The following example illustrates that.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-script]
|
||
--------------------------------------------------
|
||
<1> `setScript` to increment the `likes` field on all documents with user `kimchy`.
|
||
|
||
+{request}+ supports reindexing from a remote Elasticsearch cluster. When using a remote cluster the query should be
|
||
specified inside the `RemoteInfo` object and not using `setSourceQuery`. If both the remote info and the source query are
|
||
set it results in a validation error during the request. The reason for this is that the remote Elasticsearch may not
|
||
understand queries built by the modern query builders. The remote cluster support works all the way back to Elasticsearch
|
||
0.90 and the query language has changed since then. When reaching older versions, it is safer to write the query by hand
|
||
in JSON.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-remote]
|
||
--------------------------------------------------
|
||
<1> set remote elastic cluster
|
||
|
||
+{request}+ also helps in automatically parallelizing using `sliced-scroll` to
|
||
slice on `_uid`. Use `setSlices` to specify the number of slices to use.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-slices]
|
||
--------------------------------------------------
|
||
<1> set number of slices to use
|
||
|
||
+{request}+ uses the `scroll` parameter to control how long it keeps the
|
||
"search context" alive.
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-scroll]
|
||
--------------------------------------------------
|
||
<1> set scroll time
|
||
|
||
|
||
==== Optional arguments
|
||
In addition to the options above the following arguments can optionally be also provided:
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-timeout]
|
||
--------------------------------------------------
|
||
<1> Timeout to wait for the reindex request to be performed as a `TimeValue`
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-request-refresh]
|
||
--------------------------------------------------
|
||
<1> Refresh index after calling reindex
|
||
|
||
include::../execution.asciidoc[]
|
||
|
||
[id="{upid}-{api}-task-submission"]
|
||
==== Reindex task submission
|
||
It is also possible to submit a +{request}+ and not wait for it completion with the use of Task API. This is an equivalent of a REST request
|
||
with wait_for_completion flag set to false.
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{hlrc-tests}/ReindexIT.java[submit-reindex-task]
|
||
--------------------------------------------------
|
||
<1> A +{request}+ is constructed the same way as for the synchronous method
|
||
<2> A submit method returns a `TaskSubmissionResponse` which contains a task identifier.
|
||
<3> The task identifier can be used to get `response` from a completed task.
|
||
|
||
[id="{upid}-{api}-response"]
|
||
==== Reindex Response
|
||
|
||
The returned +{response}+ contains information about the executed operations and
|
||
allows to iterate over each result as follows:
|
||
|
||
["source","java",subs="attributes,callouts,macros"]
|
||
--------------------------------------------------
|
||
include-tagged::{doc-tests-file}[{api}-response]
|
||
--------------------------------------------------
|
||
<1> Get total time taken
|
||
<2> Check if the request timed out
|
||
<3> Get total number of docs processed
|
||
<4> Number of docs that were updated
|
||
<5> Number of docs that were created
|
||
<6> Number of docs that were deleted
|
||
<7> Number of batches that were executed
|
||
<8> Number of skipped docs
|
||
<9> Number of version conflicts
|
||
<10> Number of times request had to retry bulk index operations
|
||
<11> Number of times request had to retry search operations
|
||
<12> The total time this request has throttled itself not including the current throttle time if it is currently sleeping
|
||
<13> Remaining delay of any current throttle sleep or 0 if not sleeping
|
||
<14> Failures during search phase
|
||
<15> Failures during bulk index operation
|