164 lines
7.3 KiB
Plaintext
164 lines
7.3 KiB
Plaintext
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[[java-rest-high-document-delete-by-query]]
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=== Delete By Query API
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[[java-rest-high-document-delete-by-query-request]]
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==== Delete By Query Request
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A `DeleteByQueryRequest` can be used to delete documents from an index. It requires an existing index (or a set of indices)
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on which deletion is to be performed.
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The simplest form of a `DeleteByQueryRequest` looks like:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request]
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--------------------------------------------------
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<1> Creates the `DeleteByQueryRequest` on a set of indices.
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By default version conflicts abort the `DeleteByQueryRequest` process but you can just count them by settings it to
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`proceed` in the request body
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-conflicts]
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--------------------------------------------------
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<1> Set `proceed` on version conflict
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You can limit the documents by adding a type to the source or by adding a query.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-typeOrQuery]
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--------------------------------------------------
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<1> Only copy `doc` type
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<2> Only copy documents which have field `user` set to `kimchy`
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It’s also possible to limit the number of processed documents by setting size.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-size]
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--------------------------------------------------
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<1> Only copy 10 documents
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By default `DeleteByQueryRequest` uses batches of 1000. You can change the batch size with `setBatchSize`.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-scrollSize]
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--------------------------------------------------
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<1> Use batches of 100 documents
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`DeleteByQueryRequest` also helps in automatically parallelizing using `sliced-scroll` to
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slice on `_uid`. Use `setSlices` to specify the number of slices to use.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-slices]
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--------------------------------------------------
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<1> set number of slices to use
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`DeleteByQueryRequest` uses the `scroll` parameter to control how long it keeps the "search context" alive.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-scroll]
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--------------------------------------------------
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<1> set scroll time
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If you provide routing then the routing is copied to the scroll query, limiting the process to the shards that match
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that routing value.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-routing]
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--------------------------------------------------
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<1> set routing
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==== Optional arguments
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In addition to the options above the following arguments can optionally be also provided:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-timeout]
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--------------------------------------------------
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<1> Timeout to wait for the delete by query request to be performed as a `TimeValue`
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-refresh]
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--------------------------------------------------
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<1> Refresh index after calling delete by query
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-request-indicesOptions]
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--------------------------------------------------
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<1> Set indices options
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[[java-rest-high-document-delete-by-query-sync]]
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==== Synchronous Execution
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-execute]
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--------------------------------------------------
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[[java-rest-high-document-delete-by-query-async]]
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==== Asynchronous Execution
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The asynchronous execution of an delete by query request requires both the `DeleteByQueryRequest`
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instance and an `ActionListener` instance to be passed to the asynchronous
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method:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-execute-async]
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--------------------------------------------------
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<1> The `DeleteByQueryRequest` to execute and the `ActionListener` to use when
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the execution completes
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The asynchronous method does not block and returns immediately. Once it is
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completed the `ActionListener` is called back using the `onResponse` method
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if the execution successfully completed or using the `onFailure` method if
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it failed.
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A typical listener for `BulkByScrollResponse` looks like:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-execute-listener]
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--------------------------------------------------
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<1> Called when the execution is successfully completed. The response is
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provided as an argument and contains a list of individual results for each
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operation that was executed. Note that one or more operations might have
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failed while the others have been successfully executed.
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<2> Called when the whole `DeleteByQueryRequest` fails. In this case the raised
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exception is provided as an argument and no operation has been executed.
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[[java-rest-high-document-delete-by-query-execute-listener-response]]
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==== Delete By Query Response
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The returned `BulkByScrollResponse` contains information about the executed operations and
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allows to iterate over each result as follows:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/CRUDDocumentationIT.java[delete-by-query-response]
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--------------------------------------------------
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<1> Get total time taken
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<2> Check if the request timed out
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<3> Get total number of docs processed
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<4> Number of docs that were deleted
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<5> Number of batches that were executed
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<6> Number of skipped docs
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<7> Number of version conflicts
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<8> Number of times request had to retry bulk index operations
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<9> Number of times request had to retry search operations
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<10> The total time this request has throttled itself not including the current throttle time if it is currently sleeping
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<11> Remaining delay of any current throttle sleep or 0 if not sleeping
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<12> Failures during search phase
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<13> Failures during bulk index operation
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