Increase character limit for autosuggest suggestions

Issue

Autosuggest queries sent to the /suggest endpoint are limited to approximately 31 characters, even when longer input strings are provided. For example, the following query works:

https://<fusion-host>/api/apps/<app-name>/query/<collection-name>?q=New York Life Investments SIMP

But adding more characters to the query string fails to return results:

https://<fusion-host>/api/apps/<app-name>/query/<collection-name>?q=New York Life Investments SIMPLE

Diagnosis

This issue is not controlled by the solrconfig.xml file or suggest handler settings. Instead, it is determined by the schema definition of the field type used in the suggest dictionary.

Specifically, the EdgeNGramFilterFactory used in the field type (commonly named text_suggest_edge) restricts the maximum number of characters analyzed.

To confirm, check your managed-schema.xml file for the suggester's fieldType definition. For example:

<fieldType name="text_suggest_edge" class="solr.TextField" multiValued="true">
  <analyzer type="index">
    <tokenizer class="solr.StandardTokenizerFactory"/>
    <filter class="solr.LowerCaseFilterFactory"/>
    <filter class="solr.EdgeNGramFilterFactory" minGramSize="3" maxGramSize="30"/>
  </analyzer>
  <analyzer type="query">
    <tokenizer class="solr.StandardTokenizerFactory"/>
    <filter class="solr.LowerCaseFilterFactory"/>
  </analyzer>
</fieldType>

Environment

Fusion 5.9.x and later
Fusion deployments using suggest components backed by EdgeNGram-based field types

Cause

The maxGramSize attribute in the EdgeNGramFilterFactory limits how many characters are indexed for autocomplete purposes. A lower setting, such as 30, prevents matches on longer strings.

Resolution

Update the schema to increase the maxGramSize parameter.

Update the schema

1. Edit the managed-schema.xml for the collection that backs the suggester component.

2. Locate the text_suggest_edge or equivalent fieldType used in the suggester.

3. Modify the EdgeNGramFilterFactory filter to increase maxGramSize. Example:

<filter class="solr.EdgeNGramFilterFactory" minGramSize="3" maxGramSize="150"/>

Reload the collection

After updating the schema, reload the collection using:

curl -u <username>:<password> "https://<fusion-host>/api/apollo/collections/<collection-name>/reload"

Rebuild the suggester index

Use the Fusion UI or API to trigger a reindex of the suggester pipeline to reflect the updated schema changes.

Note: Failure to reload the collection and rebuild the suggester will result in the changes not taking effect.