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I have an index and I wanna know the medium number of the field "comments". Here's my (basic) query:

GET /prova/_search?search_type=count
{
    "aggs" : {
        "avg_grade" : { "avg" : { "field" : "commenti" } }
    }
}

But something goes wrong and the reply is:

{
   "error": "SearchPhaseExecutionException[Failed to execute phase [query], all shards failed; shardFailures {[T4svhJ5TTmOfY2-E4_t9YQ][prova][0]: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexNumericFieldData]}{[T4svhJ5TTmOfY2-E4_t9YQ][prova][1]: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexNumericFieldData]}{[T4svhJ5TTmOfY2-E4_t9YQ][prova][2]: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexNumericFieldData]}{[T4svhJ5TTmOfY2-E4_t9YQ][prova][3]: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexNumericFieldData]}{[T4svhJ5TTmOfY2-E4_t9YQ][prova][4]: ClassCastException[org.elasticsearch.index.fielddata.plain.PagedBytesIndexFieldData cannot be cast to org.elasticsearch.index.fielddata.IndexNumericFieldData]}]",
   "status": 500
}

What's the problem?

Improve this question
5
  • Is the field commenti in more that one type? Is it always a numeric type? Commented Feb 20, 2015 at 17:23
  • possible duplicate of elasticsearch fail with error "Failed to execute phase [query_fetch], all shards failed" Commented Feb 20, 2015 at 17:28
  • Also read: devmynd.com/blog/… Commented Feb 20, 2015 at 17:29
  • Usually is a number, otherwise is an empty space Commented Feb 24, 2015 at 12:02
  • It is not a duplicate, it doesn't seem to me the same problem or however the solution isn't good for my problem, Commented Feb 24, 2015 at 12:07
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