CODEWITHSUNDEEP
solrstemming
Bokambo
Bokambo

Reputation: 4480

Stemming parameter in Solr

Is there any parameter like (edismax or dismax or any other) that i can set for stemming to work in Solr or i need to make changes in schema.xml of Solr to implement the stemming ? Problem is if i change schema.xml by default stemming/phoentic work which i dont want ? I am using Solr from third party application and in UI we have checkbox for stemming to check/uncheck , i pass these paramaters to Solr and get the data from Solr, i cant pass this UI parameter to SOlr, so if there is any parameter at Solr side i can pass that for stemming to work ?

Please let me know ?

Upvotes: 1

Views: 102

Answers (1)

MatsLindh
MatsLindh

Reputation: 52792

Stemming is performed as part of the analysis chain, and therefor is part of how the schema for that particular field is defined.

The reason for this becomes apparent when you consider how stemming works - for stemming to make sense, the term has to be stemmed when it's being indexed, as well as when being queried.

Lucene takes your input string, runs it through your analysis chain and saves the generated tokens to its index. Giving it what are you asking will probably end up as what, are, you, ask after tokenizing by whitespace and applying stemming.

The same operation happens when querying, so if someone searches for asks, the token gets stemmed to ask - and then compared against what's in the index. If stemming hadn't taken place when indexing, you'd end up with asking in the index, and ask when querying - and that isn't a match, since the tokens aren't the same.

In your third party application the stemming option probably performs stemming inside the application before sending the content to Solr.

You can also use the Schema API to dynamically update and change field type definitions.

Upvotes: 1

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