Search::Elasticsearch::Client::6_0::Bulk(3p)

NAME
Search::Elasticsearch::Client::6_0::Bulk - A helper module for the Bulk API

VERSION
version 6.00

SYNOPSIS
    use Search::Elasticsearch;

    my $es   = Search::Elasticsearch->new;
    my $bulk = $es->bulk_helper(
        index   => 'my_index',
        type    => 'my_type'
    );

    # Index docs:
    $bulk->index({ id => 1, source => { foo => 'bar' }});
    $bulk->add_action( index => { id => 1, source => { foo=> 'bar' }});

    # Create docs:
    $bulk->create({ id => 1, source => { foo => 'bar' }});
    $bulk->add_action( create => { id => 1, source => { foo=> 'bar' }});
    $bulk->create_docs({ foo => 'bar' })

    # Delete docs:
    $bulk->delete({ id => 1});
    $bulk->add_action( delete => { id => 1 });
    $bulk->delete_ids(1,2,3)

    # Update docs:
    $bulk->update({ id => 1, script => '...' });
    $bulk->add_action( update => { id => 1, script => '...' });

    # Manual flush
    $bulk->flush;

DESCRIPTION
This module provides a wrapper for the "bulk()" in Search::Elasticsearch::Client::6_0::Direct method which makes it easier to run multiple create, index, update or delete actions in a single request.

The Search::Elasticsearch::Client::6_0::Bulk module acts as a queue, buffering up actions until it reaches a maximum count of actions, or a maximum size of JSON request body, at which point it issues a bulk() request.

Once you have finished adding actions, call "flush()" to force the final bulk() request on the items left in the queue.

This class does Search::Elasticsearch::Client::6_0::Role::Bulk and Search::Elasticsearch::Role::Is_Sync.

CREATING A NEW INSTANCE

  new()
    my $bulk = $es->bulk_helper(

        index       => 'default_index',     # optional
        type        => 'default_type',      # optional
        %other_bulk_params                  # optional

        max_count   => 1_000,               # optional
        max_size    => 1_000_000,           # optional
        max_time    => 6,                   # optional

        verbose     => 0 | 1,               # optional

        on_success  => sub {...},           # optional
        on_error    => sub {...},           # optional
        on_conflict => sub {...},           # optional

    );

The new() method returns a new $bulk object. You must pass your Search::Elasticsearch client as the "es" argument.

The "index" and "type" parameters provide default values for "index" and "type", which can be overridden in each action. You can also pass any other values which are accepted by the bulk() method.

See "flush()" for more information about the other parameters.

FLUSHING THE BUFFER

  flush()
    $result = $bulk->flush;

The flush() method sends all buffered actions to Elasticsearch using a bulk() request.

  Auto-flushing
An automatic "flush()" is triggered whenever the "max_count", "max_size", or "max_time" threshold is breached. This causes all actions in the buffer to be sent to Elasticsearch.

•   "max_count"

    The maximum number of actions to allow before triggering a "flush()". This can be disabled by setting "max_count" to 0. Defaults to "1,000".

•   "max_size"

    The maximum size of JSON request body to allow before triggering a "flush()". This can be disabled by setting "max_size" to 0. Defaults to "1_000,000" bytes.

•   "max_time"

    The maximum number of seconds to wait before triggering a flush. Defaults to 0 seconds, which means that it is disabled. Note: This timeout is only triggered when new items are added to the queue, not in the background.

  Errors when flushing
There are two types of error which can be thrown when "flush()" is called, either manually or automatically.

•   Temporary Elasticsearch errors

    A "Cxn" error like a "NoNodes" error which indicates that your cluster is down. These errors do not clear the buffer, as they can be retried later on.

•   Action errors

    Individual actions may fail. For instance, a "create" action will fail if a document with the same "index", "type" and "id" already exists. These action errors are reported via callbacks.

  Using callbacks
By default, any Action errors (see above) cause warnings to be written to "STDERR". However, you can use the "on_error", "on_conflict" and "on_success" callbacks for more fine-grained control.

All callbacks receive the following arguments:

$action
    The name of the action, ie "index", "create", "update" or "delete".

$response
    The response that Elasticsearch returned for this action.

$i  The index of the action, ie the first action in the flush request will have $i set to 0, the second will have $i set to 1 etc.

"on_success"

    my $bulk = $es->bulk_helper(
        on_success  => sub {
            my ($action,$response,$i) = @_;
            # do something
        },
    );

The "on_success" callback is called for every action that has a successful response.

"on_conflict"

    my $bulk = $es->bulk_helper(
        on_conflict  => sub {
            my ($action,$response,$i,$version) = @_;
            # do something
        },
    );

The "on_conflict" callback is called for actions that have triggered a "Conflict" error, eg trying to "create" a document which already exists. The $version argument will contain the version number of the document currently stored in Elasticsearch (if found).

"on_error"

    my $bulk = $es->bulk_helper(
        on_error  => sub {
            my ($action,$response,$i) = @_;
            # do something
        },
    );

The "on_error" callback is called for any error (unless the "on_conflict") callback has already been called).

  Disabling callbacks and autoflush
If you want to be in control of flushing, and you just want to receive the raw response that Elasticsearch sends instead of using callbacks, then you can do so as follows:

    my $bulk = $es->bulk_helper(
        max_count   => 0,
        max_size    => 0,
        on_error    => undef
    );

    $bulk->add_actions(....);
    $response = $bulk->flush;

CREATE, INDEX, UPDATE, DELETE

  add_action()
    $bulk->add_action(
        create => { ...params... },
        index  => { ...params... },
        update => { ...params... },
        delete => { ...params... }
    );

The add_action() method allows you to add multiple "create", "index", "update" and "delete" actions to the queue. The first value is the action type, and the second value is the parameters that describe that action. See the individual helper methods below for details.

Note: Parameters like "index" or "type" can be specified as "index" or as "_index", so the following two lines are equivalent:

    index => { index  => 'index', type  => 'type', id  => 1, source => {...}},
    index => { _index => 'index', _type => 'type', _id => 1, source => {...}},

Note: The "index" and "type" parameters can be specified in the params for any action, but if not specified, will default to the "index" and "type" values specified in "new()". These are required parameters: they must be specified either in "new()" or in every action.

  create()
    $bulk->create(
        { index => 'custom_index',         source => { doc body }},
        { type  => 'custom_type', id => 1, source => { doc body }},
        ...
    );

The create() helper method allows you to add multiple "create" actions. It accepts the same parameters as "create()" in Search::Elasticsearch::Client::6_0::Direct except that the document body should be passed as the "source" or "_source" parameter, instead of as "body".

  create_docs()
    $bulk->create_docs(
        { doc body },
        { doc body },
        ...
    );

The create_docs() helper is a shorter form of "create()" which can be used when you are using the default "index" and "type" as set in "new()" and you are not specifying a custom "id" per document. In this case, you can just pass the individual document bodies.

  index()
    $bulk->index(
        { index => 'custom_index',         source => { doc body }},
        { type  => 'custom_type', id => 1, source => { doc body }},
        ...
    );

The index() helper method allows you to add multiple "index" actions. It accepts the same parameters as "index()" in Search::Elasticsearch::Client::6_0::Direct except that the document body should be passed as the "source" or "_source" parameter, instead of as "body".

  delete()
    $bulk->delete(
        { index => 'custom_index', id => 1},
        { type  => 'custom_type',  id => 2},
        ...
    );

The delete() helper method allows you to add multiple "delete" actions. It accepts the same parameters as "delete()" in Search::Elasticsearch::Client::6_0::Direct.

  delete_ids()
    $bulk->delete_ids(1,2,3...)

The delete_ids() helper method can be used when all of the documents you want to delete have the default "index" and "type" as set in "new()". In this case, all you have to do is to pass in a list of IDs.

  update()
    $bulk->update(
        { id            => 1,
          doc           => { partial doc },
          doc_as_upsert => 1
        },
        { id            => 2,
          script        => { script }
          upsert        => { upsert doc }
        },
        ...
    );

The update() helper method allows you to add multiple "update" actions. It accepts the same parameters as "update()" in Search::Elasticsearch::Client::6_0::Direct. An update can either use a partial doc which gets merged with an existing doc (example 1 above), or can use a "script" to update an existing doc (example 2 above). More information on "script" can be found here: "update()" in Search::Elasticsearch::Client::6_0::Direct.

AUTHOR
Clinton Gormley <drtech@cpan.org>

COPYRIGHT AND LICENSE
This software is Copyright (c) 2017 by Elasticsearch BV.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004