fix field data stats doc
fix field data stats doc

fubuki/elasticsearch,vorce/es-metrics,aparo/elasticsearch,vorce/es-metrics,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch,aparo/elasticsearch,vorce/es-metrics,fubuki/elasticsearch