lucene-to-dsl

Introduction

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

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)

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).

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