How to show day names,using date-histogram aggregation in elascticsearch

Question

I have been trying to use date histogram aggregation in elasticsearch and it returns the date as epoch or in yy-mm-dd-mm-ss format. But what I want is to get document count

Answer 1

You need to go for a different approach. Using scripts , you can convert date time into week day. On this value if you apply terms aggregation , it should work fine.

Script to convert date time value into weekday

Date date = new Date(doc['created_at'].value) ; 
java.text.SimpleDateFormat format = new java.text.SimpleDateFormat('EEE');
format.format(date)

Query to get the values

{
  "aggs": {
    "perWeekDay": {
      "terms": {
        "script": "Date date = new Date(doc['created_at'].value) ; java.text.SimpleDateFormat format = new java.text.SimpleDateFormat('EEE');format.format(date)"
      }
    }
  }
}

You can also find some more examples on using scripting in aggregations here.