[ckan-dev] can you tell me where and which file trigger to create new Solr index file automatically when creating a new dataset

[bupt bupt]

hello everyone,
      now I can create CKAN dataset and upload data file, when I create one
dataset, I find that solr index files are updated in "
/var/lib/solr/data/index" automatically, But what confused me most is where
and which file trigger to create new Solr index file automatically? Can you
help me point out where and which file realize this automatic update
behavior? Can you point out the file path and which function do it?
 Thank you very much~~
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