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[[index_management]]
== Index management operations
Index management operations allow you to manage the indices in your {es}
cluster, such as creating, deleting and updating indices and their
mappings/settings.
=== Create an index
The index operations are all contained under a distinct namespace, separated
from other methods that are on the root client object. As an example, let's
create a new index:
[source,php]
----
$client = ClientBuilder::create()->build();
$params = [
'index' => 'my_index'
];
// Create the index
$response = $client->indices()->create($params);
----
{zwsp} +
You can specify any parameters that would normally be included in a new index
creation API. All parameters that would normally go in the request body are
located in the 'body' parameter:
[source,php]
----
$client = ClientBuilder::create()->build();
$params = [
'index' => 'my_index',
'body' => [
'settings' => [
'number_of_shards' => 3,
'number_of_replicas' => 2
],
'mappings' => [
'_source' => [
'enabled' => true
],
'properties' => [
'first_name' => [
'type' => 'keyword'
],
'age' => [
'type' => 'integer'
]
]
]
]
];
// Create the index with mappings and settings now
$response = $client->indices()->create($params);
----
{zwsp} +
=== Create an index (advanced example)
This is a more complicated example of creating an index, showing how to define
analyzers, tokenizers, filters and index settings. Although essentially the same
as the previous example, the more complicated example can be helpful for "real
world" usage of the client since this particular syntax is easy to mess up.
[source,php]
----
$params = [
'index' => 'reuters',
'body' => [
'settings' => [ <1>
'number_of_shards' => 1,
'number_of_replicas' => 0,
'analysis' => [ <2>
'filter' => [
'shingle' => [
'type' => 'shingle'
]
],
'char_filter' => [
'pre_negs' => [
'type' => 'pattern_replace',
'pattern' => '(\\w+)\\s+((?i:never|no|nothing|nowhere|noone|none|not|havent|hasnt|hadnt|cant|couldnt|shouldnt|wont|wouldnt|dont|doesnt|didnt|isnt|arent|aint))\\b',
'replacement' => '~$1 $2'
],
'post_negs' => [
'type' => 'pattern_replace',
'pattern' => '\\b((?i:never|no|nothing|nowhere|noone|none|not|havent|hasnt|hadnt|cant|couldnt|shouldnt|wont|wouldnt|dont|doesnt|didnt|isnt|arent|aint))\\s+(\\w+)',
'replacement' => '$1 ~$2'
]
],
'analyzer' => [
'reuters' => [
'type' => 'custom',
'tokenizer' => 'standard',
'filter' => ['lowercase', 'stop', 'kstem']
]
]
]
],
'mappings' => [ <3>
'properties' => [
'title' => [
'type' => 'text',
'analyzer' => 'reuters',
'copy_to' => 'combined'
],
'body' => [
'type' => 'text',
'analyzer' => 'reuters',
'copy_to' => 'combined'
],
'combined' => [
'type' => 'text',
'analyzer' => 'reuters'
],
'topics' => [
'type' => 'keyword'
],
'places' => [
'type' => 'keyword'
]
]
]
]
];
$client->indices()->create($params);
----
<1> The top level `settings` contains config about the index (# of shards, etc)
as well as analyzers.
<2> `analysis` is nested inside of `settings`, and contains tokenizers, filters,
char filters and analyzers.
<3> `mappings` is another element nested inside of `settings`, and contains the
mappings for various types.
=== Delete an index
Deleting an index is very simple:
[source,php]
----
$params = ['index' => 'my_index'];
$response = $client->indices()->delete($params);
----
{zwsp} +
=== PUT Settings API
The PUT Settings API allows you to modify any index setting that is dynamic:
[source,php]
----
$params = [
'index' => 'my_index',
'body' => [
'settings' => [
'number_of_replicas' => 0,
'refresh_interval' => -1
]
]
];
$response = $client->indices()->putSettings($params);
----
{zwsp} +
=== GET Settings API
The GET Settings API shows you the currently configured settings for one or more
indices:
[source,php]
----
// Get settings for one index
$params = ['index' => 'my_index'];
$response = $client->indices()->getSettings($params);
// Get settings for several indices
$params = [
'index' => [ 'my_index', 'my_index2' ]
];
$response = $client->indices()->getSettings($params);
----
{zwsp} +
=== PUT Mappings API
The PUT Mappings API allows you to modify or add to an existing index's mapping.
[source,php]
----
// Set the index and type
$params = [
'index' => 'my_index',
'body' => [
'_source' => [
'enabled' => true
],
'properties' => [
'first_name' => [
'type' => 'text',
'analyzer' => 'standard'
],
'age' => [
'type' => 'integer'
]
]
]
];
// Update the index mapping
$client->indices()->putMapping($params);
----
{zwsp} +
=== GET Mappings API
The GET Mappings API returns the mapping details about your indices. Depending
on the mappings that you wish to retrieve, you can specify one of more indices:
[source,php]
----
// Get mappings for all indices
$response = $client->indices()->getMapping();
// Get mappings in 'my_index'
$params = ['index' => 'my_index'];
$response = $client->indices()->getMapping($params);
// Get mappings for two indices
$params = [
'index' => [ 'my_index', 'my_index2' ]
];
$response = $client->indices()->getMapping($params);
----
{zwsp} +
=== Other APIs in the indices namespace
There are a number of other APIs in the indices namespace that allow you to
manage your {es} indices (add/remove templates, flush segments, close indices,
etc).
If you use an IDE with autocompletion, you should be able to easily explore the
indices namespace by typing:
[source,php]
----
$client->indices()->
----
And perusing the list of available methods. Alternatively, browsing the
`\Elasticsearch\Namespaces\Indices.php` file shows you the full list of
available method calls (as well as parameter lists in the comments for each
method).