YQL Elastic

YQL Elastic ( aka Why QL ) is a golang library implementing its own query language to construct Bool based Elasticsearch queries.

It is based on the Lucene query language but doesn't implement duplicate operators like AND, OR, NOT ect...

It is useful when Elasticsearch's query syntax shows its limit ( eg Nested documents ).

Features

• Parse Lucene like query to Olivere's Elasticsearch Client Query interface.
• Supports groups
• Supports field remapping
• Supports nested fields

Lexical declarations :

• Any term or group of term following + is a Must condition.
• Any term or group of term following - is a MustNot condition.
• Any term or group of term without preceding operator is a Should condition.
• A group is query inside delimiting ()
• Groups can have sub-groups
• A term can be a single word
• A term can be a phrase between quote
• A term can be a field, prefixed by : with or without a (single word or phrase) as value
• Any field having a > after its : is a greater range condition.
• Any field having a < after its : is a lower range condition.
• Any field having a = after its : is a precise match condition.
• Any field having a ~ after its : is a regex condition.

Quirks

• Field groups (eg field:(test1 -test2)) is directly passed to SimpleQueryString. This means AND OR
  and other lucene operators are active for this field.

Build tester

You need the Go tools installed to re-generate the *_string.go files if necessary.

$ go generate
$ go build ./cmd/testyql
$ ./testyql "+(test test2 test3) wrong'test'  +'test phrase phrase' --((-test4  +test34:\"323\" test14 test453) -(a:test +b:3333)) (test:)"
{"bool":{"must":[{"bool":{"should":[{"multi_match":{"fields":["default_field"],"query":"test"}},{"multi_match":{"fields":["default_field"],"query":"test2"}},{"multi_match":{"fields":["default_field"],"query":"test3"}}]}},{"multi_match":{"fields":["default_field"],"query":"'test phrase phrase'"}}],"must_not":{"bool":{"must_not":{"bool":{"must":{"multi_match":{"fields":["b"],"query":"3333"}},"should":{"multi_match":{"fields":["a"],"query":"test"}}}},"should":{"bool":{"must":{"multi_match":{"fields":["test34"],"query":"\"323\""}},"must_not":{"multi_match":{"fields":["default_field"],"query":"test4"}},"should":[{"multi_match":{"fields":["default_field"],"query":"test14"}},{"multi_match":{"fields":["default_field"],"query":"test453"}}]}}}},"should":[{"multi_match":{"fields":["default_field"],"query":"wrong'test'"}},{"bool":{"should":{"multi_match":{"fields":["test"],"query":""}}}}]}}

Examples :

Valid queries

• test
• +(test test2 test3) e'test' +'super phrase' --((-test4 +test:"323" e qe) -(a:test +b:ewe)) (test:)
• +(text field1:(+test -test2) -field2:text2 +test.id:43

Usage

From cmd/testysql/main.go:

package main

import (
	"encoding/json"
	"fmt"
	"github.com/LeakIX/yql-elastic"
	"log"
	"os"
)

elasticQuery, err := yql_elastic.Parse(os.Args[1],
    yql_elastic.WithDefaultFields([]string{"events.hostname","events.summary"}),
    yql_elastic.WithNestedPaths([]string{"events"}),
    yql_elastic.WithFieldMapping(map[string]string{
        "host":"events.host",
        "port":"open_ports",
        "fingerprint":"fingerprints",
        "ssl":"events.ssl",
    }),
)
if err != nil {
    log.Fatal(err)
}
querySource, err := elasticQuery.Source()
if err != nil {
    log.Fatal(err)
}
querySourceJson, err := json.Marshal(querySource)
if err != nil {
    log.Fatal(err)
}
fmt.Println(string(querySourceJson))