ElasticSearch count returned result

Question

I want to count number of document returned as a result of a query with size limit. For example, I run following query:

curl -XGET http://localhost:9200/logs_-*/a_logs/_search?pretty=true -d '
{
"query" : {
    "match_all" : {  }
},
"size" : 5,
"from" : 8318
}'

and I get:

{
"took" : 5,
"timed_out" : false,
"_shards" : {
"total" : 159,
"successful" : 159,
"failed" : 0
},
  "hits" : {
  "total" : 8319,
  "max_score" : 1.0,
  "hits" : [ {
....

Total documents matching my query are 8319, but I fetched at max 5. Only 1 document was returned since I queried "from" 8318.

In the response, I do not know how many documents are returned. I want to write a query such that the number of documents being returned are also present in some field. Maybe some facet may help, but I could not figure out. Kindly help.

Answer 1

Your query :

{
"query" : {
    "match_all" : {  }
},

=> Means that you ask all your data

"size" : 5,

=> You want to display only 5 results

"from" : 8318

=> You start from the 8318 records

ElasticSearch respons :

....

"hits" : {
  "total" : 8319,

... => Elastic search told you that there is 8319 results in his index.

You ask him all the result and you start from the 8318.

8319 - 8318 = 1 So you have 1 result.

Try by removing the from.