use temp files when unzipping documents

avoid indexing empty content

include _index field in search response

faster ingest; search function

index ingest emulating ElastiSearch

Merge commit 'e8b844f7649b954be8b2b7b20d4026c33c4efd51'

Squashed 'cgilite/' changes from 426dac5..d7b1281

d7b1281 bugfix: incorrect call of `DB2 "" new`

git-subtree-dir: cgilite
git-subtree-split: d7b1281dbec20a236a14bd0fa8771da1ce353d00

Merge commit '9ffde1819707b7a9b5ef18f15a9a5819c876f253' as 'cgilite'

Squashed 'cgilite/' content from commit 426dac5

git-subtree-dir: cgilite
git-subtree-split: 426dac52b5648fea4854fb141452d113b5c2251a

cgilite pull