optimize index nested/object fields

[alexander3771]

Hi!

We don't need to create brand new document for every field we index

[alexander3771]

Hello, @safwanrahman!
Please take a look, this is small fix just to increase speed of index nested objects

[safwanrahman]

LGTM. r+

[codecov-commenter]

Codecov Report

Base: 49.81% // Head: 53.66% // Increases project coverage by +3.84% 🎉

Coverage data is based on head (89d2376) compared to base (6129dfc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #412      +/-   ##
==========================================
+ Coverage   49.81%   53.66%   +3.84%     
==========================================
  Files          12       12              
  Lines        1088     1010      -78     
==========================================
  Hits          542      542              
+ Misses        546      468      -78     

Impacted Files	Coverage Δ
django_elasticsearch_dsl/fields.py	57.20% <100.00%> (+7.61%)	⬆️
django_elasticsearch_dsl/documents.py	57.48% <0.00%> (+1.34%)	⬆️
...sticsearch_dsl/management/commands/search_index.py	27.92% <0.00%> (+1.80%)	⬆️
django_elasticsearch_dsl/registries.py	64.49% <0.00%> (+7.44%)	⬆️

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