Wildcard and slashes

Elastic Stack Elasticsearch
2

Assuming that you are using standard analyzer, this is what these 5 queries
are translated into on Lucene level:

1: _all:24* - prefix query for terms that start with "24"
2: _all:24 _all:account - query for the term "24" or the term "account"
3: _all:24 _all:a* - query for the term "24" or prefix query for terms
that start with "a"
4: _all:a* - prefix query for terms that start with "a"
5: _all:24/a* - prefix query for terms that start with "24/a"

Cases 2-4 are obvious, but cases 1 and 5, probably, require some
explanation. By default, wildcard terms are not analyzed. This is why 5th
case is getting translated into prefix query with the prefix "24/a". As you
correctly noticed, "24/account" is indexed as two tokens "24" and
"account". So, there are no tokens in the index that start with 24/a and
therefore 5th case doesn't return any results. In the case 1, wildcard
terms are analyzed and "24/a" is getting translated into two tokens "24"
and "a". The token "a*" is a stopword and it's getting dropped and the
query is getting translated into prefix query for terms that start with 24.

On Wednesday, March 21, 2012 6:29:49 PM UTC-4, chimingc wrote:

I've indexed this: "24/account".
I understand that it's been tokenized into "24" and "account", which is not
a problem for me.

However, when I query "24/a*", it finds no match.

Then I tried the following cases:

  1. This works
    "query_string": {
    "analyze_wildcard": true,
    "query":"24/a*"
    }

  2. This works
    "query_string": {
    "query":"24/account"
    }

  3. This works
    "query_string": {
    "query":"24 / a*"
    }

  4. This works
    "query_string": {
    "query":"a*"
    }

  5. This doesn't work
    "query_string": {
    "query":"24/a*"
    }

I can't explain why 5 doesn't work. Perhaps without setting
analyze_wildcard
to true, elasticsearch simply removes the slash and searches for "24a*"?

What exactly does analyze_wildcard do when set to true?
As you can see 3 and 4 work without setting analyze_wildcard to true. So
when do we need to set it to true?

Thanks,
jimmy

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