Pfthb

Documentation on reindex API: https://www.elastic.co/guide/en/elasticsearch/client/php-api/6.0/ElasticsearchPHP_Endpoints.html#Elasticsearch_Clientreindex_reindex

/*
$params['refresh'] = (boolean) Should the effected indexes be refreshed?
 ['timeout'] = (time) Time each individual bulk request should wait for shards that are unavailable
 ['consistency'] = (enum) Explicit write consistency setting for the operation
 ['wait_for_completion'] = (boolean) Should the request should block until the reindex is complete
 ['requests_per_second'] = (float) The throttle for this request in sub-requests per second. 0 means set no throttle
 ['body'] = (array) The search definition using the Query DSL and the prototype for the index request (Required)
 ['body'] = (array) Request body
*/

$params = [
 // ...
];

$client = ClientBuilder::create()->build();
$response = $client->reindex($params);

Elasticsearch version is 5.6.13.

I was attempting to reindex a source index to a destination index using the PHP client's reindex API above. The sourceIndex has only 1 document.

Request:

$params = [
 'body' => [
 'source' => [
 'index' => 'sourceIndex',
 ],
 'dest' => [
 'index' => 'destIndex'
 ]
 ]
];
$response = $client->reindex($params);

Response:

(
 [took] => 2
 [timed_out] =>
 [total] => 0
 [updated] => 0
 [created] => 0
 [deleted] => 0
 [batches] => 0
 [version_conflicts] => 0
 [noops] => 0
 [retries] => Array
 (
 [bulk] => 0
 [search] => 0
 )

 [throttled_millis] => 0
 [requests_per_second] => -1
 [throttled_until_millis] => 0
 [failures] => Array
 (
 )

)

As you can see, the document reindexed is 0 ([total] => 0).

It works just fine when done using Kibana's DevTool, but not elasticsearch-php client.

POST _reindex

 "source": 
 "index": "sourceIndex"
 ,
 "dest": 
 "index": "destIndex"
 

Any help is appreciated. If you need more details to help answer this question, let me know.

FYI - In case someone happens to face the same issue. The issue was that the source index had refresh_interval set to -1. For reindex operation to work, just refresh the source index prior to calling the _reindex API.