0.15.2: zip / tar.gz / issues

Release Notes:

Don’t “double” cache a facet filter / query facet (#734)
Delete API: Allow to set _parent on it (will simply set the routing value) (#742)
Query DSL: flt_field does not allow to set min_similarity and prefix_length (#744)
Refresh getting called without really needed to refresh (#749)

Date Histogram Facet: NPE if using “1w” interval (#727)
Prefix inside a dis_max / bool query broken (#732)
Searching while an index is being allocated and no active shards exists within a “shard replication group” can cause search “misses” (#736)
All Field: All field can fail to analyze input data (rare cases) (#743)