Fix searchBody docs and add example
Fix searchBody docs and add example

The docs listed `seachQuery` instead of `searchBody`. This commit corrects that and adds a short `searchBody` example.
SpinGo/elasticsearch-dump,huangchaosuper/elasticsearch-dump,taskrabbit/elasticsearch-dump,taskrabbit/elasticsearch-dump,leea/elasticsearch-dump,kjvalencik/elasticsearch-dump,PeoplePerHour/elasticsearch-dump