Remove last DocumentMapper reference from MappingLookup (#67157) #67340
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As part of elastic#66295 we made QueryShardContext perform mapping lookups through MappingLookup rather than MapperService. That helps as MapperService relies on DocumentMapper which may change througout the execution of the search request. At search time, the percolate query also needs to parse documents, which made us add a parse method to MappingLookup.Such parse method currently relies on calling DocumentMapper#parseDocument through a function, but we would like to rather make this easier to follow. (see https://github.com/elastic/elasticsearch/pull/66295/files#r544639868) We recently removed the need to provide the entire DocumentMapper to DocumentParser#parse, opening the possibility for using DocumentParser directly when needing to parse a document at query time. This commit adds everything that is needed (namely Mapping, IndexSettings and IndexAnalyzers) to MappingLookup so that it can parse a document through DocumentParser without relying on DocumentMapper. As a bonus, given that MappingLookup holds a reference to these three additional objects, we can make DocumentMapper rely on MappingLookup to retrieve those and not hold its own same references to them. Along the same lines, given that MappingLookup holds all that's necessary to parse a document, the signature of DocumentParser#parse can be simplified by replacing most of its arguments with MappingLookup and retrieving what is needed from it.
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As part of #66295 we made QueryShardContext perform mapping lookups through MappingLookup rather than MapperService. That helps as MapperService relies on DocumentMapper which may change througout the execution of the search request. At search time, the percolate query also needs to parse documents, which made us add a parse method to MappingLookup.Such parse method currently relies on calling DocumentMapper#parseDocument through a function, but we would like to rather make this easier to follow. (see https://github.com/elastic/elasticsearch/pull/66295/files#r544639868)
We recently removed the need to provide the entire DocumentMapper to DocumentParser#parse, opening the possibility for using DocumentParser directly when needing to parse a document at query time. This commit adds everything that is needed (namely Mapping, IndexSettings and IndexAnalyzers) to MappingLookup so that it can parse a document through DocumentParser without relying on DocumentMapper.
As a bonus, given that MappingLookup holds a reference to these three additional objects, we can make DocumentMapper rely on MappingLookup to retrieve those and not hold its own same references to them.
Along the same lines, given that MappingLookup holds all that's necessary to parse a document, the signature of DocumentParser#parse can be simplified by replacing most of its arguments with MappingLookup and retrieving what is needed from it.