94 lines
4.0 KiB
Plaintext
94 lines
4.0 KiB
Plaintext
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[[java-rest-high-get-alias]]
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=== Get Alias API
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[[java-rest-high-get-alias-request]]
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==== Get Alias Request
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The Get Alias API uses `GetAliasesRequest` as its request object.
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One or more aliases can be optionally provided either at construction
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time or later on through the relevant setter method.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-request]
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--------------------------------------------------
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==== Optional arguments
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The following arguments can optionally be provided:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-request-alias]
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--------------------------------------------------
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<1> One or more aliases to retrieve
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-request-indices]
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--------------------------------------------------
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<1> The index or indices that the alias is associated with
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-request-indicesOptions]
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--------------------------------------------------
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<1> Setting `IndicesOptions` controls how unavailable indices are resolved and
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how wildcard expressions are expanded when looking for aliases that belong to
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specified indices.
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-request-local]
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--------------------------------------------------
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<1> The `local` flag (defaults to `false`) controls whether the aliases need
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to be looked up in the local cluster state or in the cluster state held by
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the elected master node
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[[java-rest-high-get-alias-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}/IndicesClientDocumentationIT.java[get-alias-execute]
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--------------------------------------------------
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[[java-rest-high-get-alias-async]]
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==== Asynchronous Execution
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The asynchronous execution of a get alias request requires both a `GetAliasesRequest`
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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}/IndicesClientDocumentationIT.java[get-alias-execute-async]
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--------------------------------------------------
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<1> The `GetAliasesRequest` 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 the `Boolean` response looks like:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-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
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<2> Called in case of failure. The raised exception is provided as an argument
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[[java-rest-high-get-alias-response]]
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==== Get Alias Response
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The returned `GetAliasesResponse` allows to retrieve information about the
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executed operation as follows:
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["source","java",subs="attributes,callouts,macros"]
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--------------------------------------------------
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include-tagged::{doc-tests}/IndicesClientDocumentationIT.java[get-alias-response]
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--------------------------------------------------
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<1> Retrieves a map of indices and their aliases
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