Elasticsearch instrumentalization incorectly serializes object containing dots in field name

[imamatory]

Describe your environment

OS: OS X Sequoia 15.01
Python version: Python 3.11.7
Package version: 0.47b.0
Elasticsearch: 6

What happened?

For specific queries with both field names 'name' and 'name.morph' ElasticsearchInstrumentor creates the wrong db statement and breaks the original query object.

Steps to Reproduce

Form a request like this:

body = {
 'from': 0,
 'highlight': {'fields': {'name': {},
                                    'name.morph': {}}},
 'query': {'bool': {'filter': [{'terms': {'status': ['ACTIVE']}}]}},
 'size': 3}

Expected Result

Db statement (note fields key)

("{'from': 0, 'highlight': {'fields': {'name': {}, 'name.morph': {}}}, 'query': "
 "{'bool': {'filter': '?'}}, 'size': 3}")

Original body object:

{'from': 0,
 'highlight': {'fields': {'name': {'morph': {}},
                          'name.morph': {'morph': {}}}},
 'query': {'bool': {'filter': [{'terms': {'status': ['ACTIVE']}}]}},
 'size': 3}

Actual Result

Db statement (note fields key)

("{'from': 0, 'highlight': {'fields': {'name': {'morph': {...}}}}, 'query': "
 "{'bool': {'filter': '?'}}, 'size': 3}")

The original body object becomes:

{'from': 0,
 'highlight': {'fields': {'name': {'morph': <Recursion on dict with id=4366695936>},
                          'name.morph': {'morph': <Recursion on dict with id=4366695936>}}},
 'query': {'bool': {'filter': [{'terms': {'status': ['ACTIVE']}}]}},
 'size': 3}

This body object is impossible to serialize so it breaks further on query serialization stage

Additional context

sanitize_body function mutates the original body and this is not good by itself.

Would you like to implement a fix?

Yes