ElasticSearch : field not returned - elasticsearch

Question

I am new to ElasticSearch, please forgive my stupidity.
I cant seem to get the keepalive field out of ES.
{
"_index" : "2013122320",
"_type" : "log",
"_id" : "Y1M18ZItTDaap_rOAS5YOA",
"_score" : 1.0
}
I can get other field out of it cdn:
{
"_index" : "2013122320",
"_type" : "log",
"_id" : "2neLlVNKQCmXq6etTE6Kcw",
"_score" : 1.0,
"fields" : {
"cdn" : "-"
}
}
The mapping is there:
{
"log": {
"_timestamp": {
"enabled": true,
"store": true
},
"properties": {
"keepalive": {
"type": "integer"
}
}
}
}
EDIT
We create a new index every hour using the following perl code
create_index(
index => $index,
settings => {
_timestamp => { enabled => 1, store => 1 },
number_of_shards => 3,
number_of_replicas => 1,
},
mappings => {
varnish => {
_timestamp => { enabled => 1, store => 1 },
properties => {
content_length => { type => 'integer' },
age => { type => 'integer' },
keepalive => { type => 'integer' },
host => { type => 'string', index => 'not_analyzed' },
time => { type => 'string', store => 'yes' },
<SNIPPED>
location => { type => 'string', index => 'not_analyzed' },
}
}
}
);

Answer 1

With so little informations, I can only guess :
In the mapping you gave, keepalive is not explicitely stored and alasticsearch defaults to no. If you do not store a field, you can only get it via the complete source, wich is stored by default. Or you change, the mapping, adding ("store" : "yes") to your field and reindex.
Good luck with ES, It is well worth a few days of learning.