[STORE] Relaxed the dependency on the "elasticsearch" gem

Related: elastic#665

Author: karmi

elasticsearch-persistence/elasticsearch-persistence.gemspec

@@ -23,7 +23,7 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = ">= 1.9.3"
 
-  s.add_dependency "elasticsearch",       '~> 1.1'
+  s.add_dependency "elasticsearch",       '> 1'
   s.add_dependency "elasticsearch-model", '>= 0.1'
   s.add_dependency "activesupport",       '> 4'
   s.add_dependency "activemodel",         '> 4'