What is default index analyzer?

Please format your code using </> icon as explained in this guide. It will make your post more readable.

The standard analyzer is explained here: https://www.elastic.co/guide/en/elasticsearch/reference/5.1/analysis-standard-analyzer.html

As per https://www.elastic.co/guide/en/elasticsearch/reference/5.1/analysis.html#_specifying_an_index_time_analyzer, the default analyzer is the standard one.