elasticsearch query and cURL in PHP

Question

I am just starting with elasticsearch. I want to query using cURL in php.

This code gives nothing... (see error below if I execute from command line. I am not sure that this error is caused of line breaks in console...)

$url = "curl -s -XGET http://<my_url>:9200/idx_occurrence/Occurrence/_search -d '
{
'filtered' : {
    'query' : {
        'term' : { 'kingdom_interpreted' : 'Plantae' }
    }
}

}' ";

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);

curl_setopt($ch, CURLOPT_HEADER, 0);

$return=curl_exec($ch);

var_dump($return);

but if I use this url http://<my_url>:9200/idx_occurrence/Occurrence/_search?q=kingdom_interpreted:Plantae

then I get results from cURL.

Maybe may query filter is incorrect? (I tried several options without success)

ERROR: {"error":"SearchPhaseExecutionException[Failed to execute phase [query], total failure; shardFailures {[AS6HqxgNRtyU9-pQKhJsXQ][idx_occurrence][3]: SearchParseException[[idx_occurrence][3]: from[-1],size[-1]: Parse Failure [Failed to parse source [\\n{\\n filtered : {\\n query : {\\n term : { kingdom : Plantae }\\n }\\n}\\n}]]]; nested: SearchParseException[[idx_occurrence][3]: from[-1],size[-1]: Parse Failure [No parser for element [filtered]]]; }{[AS6HqxgNRtyU9-pQKhJsXQ][idx_occurrence][2]: SearchParseException[[idx_occurrence][2]: from[-1],size[-1]: Parse Failure [Failed to parse source [\\n{\\n filtered : {\\n query : {\\n term : { kingdom : Plantae }\\n }\\n}\\n}]]]; nested: SearchParseException[[idx_occurrence][2]: from[-1],size[-1]: Parse Failure [No parser for element [filtered]]]; }]","status":500}

Answer 1

I have been using the Elastica PHP library for my elasticsearch interactions:

https://github.com/ruflin/Elastica

It had a very short learning curve. Here's an example:

$client = new Elastica_Client();
$index = $client->getIndex('idx_occurrence');
$index->getType('Occurrence');

$query_string = new Elastica_Query_QueryString('Plantae');
$query_string->setFields(array('kingdom_interpreted'));    
$query = new Elastica_Query($query_string);

$index->refresh();
$searchResults = $index->search($query);

This illustrates a Query String search limited to a specific field. $searchResults is an array of Elastica_ResultSet objects. I like Elastica because it abstracts away any cURL-related issues.

Answer 2

this is a simple request demo:

    $param = "
        {
        'filtered' : {
            'query' : {
                'term' : { 'kingdom_interpreted' : 'Plantae' }
            }
        }

        }";
    $header = array(
        "content-type: application/x-www-form-urlencoded; charset=UTF-8"
    );

    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, "http://xxxxx:9200/idx_occurrence/Occurrence/_search");
    curl_setopt($curl,CURLOPT_HTTPHEADER, $header);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $param);
    $res = curl_exec($curl);
    curl_close($curl);
    return $res;

Answer 3

I've found an answer myself to part of the question. I managed to get it by command line.

curl -XGET my_server:9200/idx_occurrence/Occurrence/_search?pretty=true -d '{ "query": { "query_string" :{"fields" : ["kingdom_interpreted"], "query": "Plantae" } } }'

using PHP to execute the (correct) cURL request just sends back an empty string. No errors in PHP logs.

$url='curl -XGET http://<my_url>:9200/idx_occurrence/Occurrence/_search?pretty=true
 -d   \'{ "query": { "query_string" :{ "fields" : ["kingdom_interpreted"], 
"query": "Plantae" } } }\'';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
ob_start();
curl_exec ($ch);
curl_close ($ch);
$data = ob_get_contents();
ob_end_clean();
var_dump($data);

Again, if instead of this $url I send this url my_url:9200/idx_occurrence/Occurrence/_search?q=kingdom_interpreted:Plantae

It works. Why?

Answer 4

$search = 'Plantae'; //search query
$fields = 'kingdom_interpreted'; //fields to look in
$results = file_get_contents('http://server:port/idx_occurrence/Occurrence/_search?q='.$search.'&fields='.$fields);