Filtering using Elasticsearch Query DSLedit
One can filter the results that SQL will run on using a standard Elasticsearch Query DSL by specifying the query in the filter parameter.
POST /_sql?format=txt
{
"query": "SELECT * FROM library ORDER BY page_count DESC",
"filter": {
"range": {
"page_count": {
"gte" : 100,
"lte" : 200
}
}
},
"fetch_size": 5
}
Which returns:
author | name | page_count | release_date ---------------+------------------------------------+---------------+------------------------ Douglas Adams |The Hitchhiker's Guide to the Galaxy|180 |1979-10-12T00:00:00.000Z
A useful and less obvious usage for standard Query DSL filtering is to search documents by a specific routing key.
Because Elasticsearch SQL does not support a routing parameter, one can specify a terms filter for the _routing field instead:
POST /_sql?format=txt
{
"query": "SELECT * FROM library",
"filter": {
"terms": {
"_routing": ["abc"]
}
}
}