Query expansion

[TusharAgey]

No description provided.

[sardapv]

Taken from stackoverflow thread : best way for query expansion

way I'd do it is to define a file of synonyms, as described in the documentation here and maintain that file.

With this one I'd create my custom token filter and use them at indexing time. Probably not a huge performance hit if you'd do this at query time, but it's better to do it at indexing time. The response time at query time will be better.

As you see in the link I provided above, you can define a simple text file where you put something like:

ivory, creme, putty =>white
...
This means that for any ivory, creme, putty found at indexing time, ES will actually index white and that's it.

And the analyzer would look like this:
"analyzer" : { "synonym" : { "tokenizer" : "whitespace", "filter" : ["synonym"] } }, "filter" : { "synonym" : { "type" : "synonym", "synonyms_path" : "analysis/synonym.txt" } }