Provided by: libsearch-elasticsearch-perl_5.01-1_all 
NAME
Search::Elasticsearch::Client::5_0::Bulk - A helper module for the Bulk API
VERSION
version 5.01
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::5_0::Direct method
which makes it easier to run multiple create, index, update or delete actions in a single request.
The Search::Elasticsearch::Client::5_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::5_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 => 5, # 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::5_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::5_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::5_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,
lang => 'mvel',
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::5_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::5_0::Direct.
AUTHOR
Clinton Gormley <drtech@cpan.org>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2016 by Elasticsearch BV.
This is free software, licensed under:
The Apache License, Version 2.0, January 2004