Luqum

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Added
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- support for elasticsearch 7

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Added
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- added Apache 2 license, while maintaining LGPLv3+

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Added
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- support for `multi_match` query in `ElasticsearchQueryBuilder`.

Fixed
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- SchemaAnalyzer, should count non text fields as not_analyzed
- `ElasticsearchQueryBuilder`'s `field_options` parameter
can accept `match_type` instead of `type` to change request type.
This is now the prefered way over `type`
which may more easily conflict with request parameters.

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Added
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- handling sub fields (aka `multi-fields`__)

__ https://www.elastic.co/guide/en/elasticsearch/reference/6.3/multi-fields.html

Fixed
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- fixed bug on equality, having more children in one tree than in the other,
was not triggering inequality if first nodes were the same !

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Added
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- handling `special characters escaping`_
- added `iter_wildcards` and `split_wildcards` to have a finer grained search of wildcard in terms

.. _`special characters escaping`: https://lucene.apache.org/core/3_6_0/queryparsersyntax.html#Escaping%20Special%20Characters

Fixed
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- fixed bug in `luqum.utils.LuceneTreeTransformer` when removing node
- fixed bug in handling approx operator on multiple words in
`luqum.elasticsearch.visitor.ElasticsearchQueryBuilder`
- test coverage now check branch

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Fixed
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- On ElasticSearch query transformation, Luqum was interpreting wildcards in Phrases where as it should not