ElasticSearch grammar

[rich...@gmail.com]

Hello,
does there happen to already exist a grammar for ElasticSearch queries?
The closest I found was for Lucene queries (https://github.com/thoward/lucene-query-parser.js), which seems a good start if one does not exist.
Richard

[Michel Krämer]

Hi Richard!

AFAIK Elasticsearch queries are written in JSON, so you just need a JSON parser. Can you give us an example of what you are trying to parse? Thanks.

Michel

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[rich...@gmail.com]

Thanks for reply!

Here is an example of an ElasticSearch query:
type:Person employments.{role.name:"CEO" employer.name:"Microsoft"} age>40 has:emailAddresses sortBy:location.city.name

[Michel Krämer]

Hi!

OK. I see. You're talking about the query string syntax, right?
https://www.elastic.co/guide/en/elasticsearch/reference/5.0/query-dsl-query-string-query.html#query-string-syntax

I don't know a parser based on PEG.js for this syntax yet. Sorry.

I had a look at the Elasticsearch source code, however, and as far as I can see they just forward the query string to Lucene, so the syntax should be the same:

https://github.com/elastic/elasticsearch/blob/master/core/src/main/java/org/elasticsearch/index/query/QueryStringQueryBuilder.java#L1026-L1032

But I don't have very much experience with query strings in Elasticsearch as I usually use the JSON Query DSL, so I might be totally wrong :-)

Michel

[rich...@gmail.com]

> OK. I see. You're talking about the query string syntax, right?

ah yes, that is the term I should be using.

I found the Lucene grammar does not support Elasticsearch nested queries, so planned to try expanding this grammar unless found a better option.