lucene-to-dsl

Introduction

This package can parse lucene query and convert to dsl used by ES (ElasticSearch), this package is pure go package.

Features

• 1、This package can convert lucene query to dsl which is used by ES.
• 2、This package can compact many leaf nodes to fewer leaf nodes (i.g. x:>1 AND x:<10 => {"range": {"x": {"gt": 1, "lt": 10}}} instead of {"bool": {"must": [{"range": {"x": {"gt": 1}}}, {"range": {"x": {"lt": 10}}}]}}). compact dsl will be serached more faster than uncompact dsl. for example two range dsl compact to single range dsl, which can reduce a range query and two bitsect intersect.
• 3、This package can filter some wrong lucene query (i.g. x:>1 AND x:<-1 is wrong lucene query).
• 4、This package can process wildcard field (i.g. _exist_:fo\?bar\*, foo\?bar\*:bar)

Limitations

• 1、only support lucene query with field name, instead of query without field name (i.e. this project can't parse query like foo OR bar, foo AND bar).
• 2、don't support prefix operator '+' / '-', for instance +fo0 -bar.
• 3、should give index mapping of field.
• 4、 will ignore boost parameter in field mapping which using in index time boosting.
• 5、 don't support alias field type (a kind of filed mapping type).

mapping of field

In order to convert more accurately, you need the configuration of a given field, such as mapping of field.