fix: Elasticsearch: Request Entity Too Large #28117 (#29062) (#29075)
Backport #29062 by @inferno-umar
Fix for gitea putting everything into one request without batching and
sending it to Elasticsearch for indexing as issued in #28117
This issue occured in large repositories while Gitea tries to
index the code using ElasticSearch.
Co-authored-by: dark-angel <70754989+inferno-umar@users.noreply.github.com>