Elasticsearch scroll api search "from" - php

Question

I have a script that generates sitemaps based on url index http://example.com/sitemap.index.xml where index is a number >0 that defines what results should be included in each chunk.
$chunk = 10000;
$counter = 0;
$scroll = $es->search(array(
"index" => "index",
"type" => "type",
"scroll" => "1m",
"search_type" => "scan",
"size" => 10,
"from" => $chunk * ($index - 1)
));
$sid = $scroll['_scroll_id'];
while($counter < $chunk){
$docs = $es->scroll(array(
"scroll_id" => $sid,
"scroll" => "1m"
));
$sid = $docs['_scroll_id'];
$counter += count($docs['hits']['hits']);
}
// ...
Now each time I access http://example.com/sitemap.1.xml or http://example.com/sitemap.2.xml the results returned from ES are exactly the same. It returns 50 results (10 per each shard) but does not seem to take count of from = 0, from = 10000.
I'm using elasticsearch-php as ES library.
Any ideas?

Answer 1

In Java, it can be done as follows
QueryBuilder query = QueryBuilders.matchAllQuery();
SearchResponse scrollResp = Constants.client.prepareSearch(index)
.setTypes(type).setSearchType(SearchType.SCAN)
.setScroll(new TimeValue(600000)).setQuery(query)
.setSize(500).execute().actionGet();
while (true) {
scrollResp = Constants.client
.prepareSearchScroll(scrollResp.getScrollId())
.setScroll(new TimeValue(600000)).execute().actionGet();
System.out.println("Record count :"
+ scrollResp.getHits().getHits().length);
total = total + scrollResp.getHits().getHits().length;
System.out.println("Total record count: " + total);
for (SearchHit hit : scrollResp.getHits()) {
//handle the hit
}
// Break condition: No hits are returned
if (scrollResp.getHits().getHits().length == 0) {
System.out.println("All records are fetched");
break;
}
}
Hope it helps.