"No suggestion is returning after spellchecking in solr"

I have been trying to implement Solr on my Localhost and using the given examples in it for testing the functionality and want to test the spellcheck functionality.

So I tried reading the official documentation and some articles on how to do so and tried implementing it but after sending the query no suggestions are being returned.

Here is my solrconfig.xml

<searchComponent name="spellcheck" class="solr.SpellCheckComponent">
    <lst name="spellchecker">
      <str name="name">default</str>
      <str name="field">fieldspellcheck_en</str>
      <str name="classname">solr.IndexBasedSpellChecker</str>
      <str name="distanceMeasure">internal</str>
      <float name="accuracy">0.5</float>
      <int name="maxEdits">2</int>
      <int name="minPrefix">1</int>
      <int name="maxInspections">5</int>
      <int name="minQueryLength">4</int>
      <float name="maxQueryFrequency">0.01</float>
      <float name="thresholdTokenFrequency">.01</float>
    </lst>
  </searchComponent>

Here is the stuff I've edited in managed-schema (previously known as schema.xml)

  <fieldType name="text_suggest" class="solr.TextField" positionIncrementGap="100">
    <analyzer>
        <tokenizer class="solr.StandardTokenizerFactory"/>
        <filter class="solr.StopFilterFactory" ignoreCase="true" words="stopwords.txt" />
        <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>
  </fieldType>
  <field name="fieldspellcheck_en" type="text_suggest" indexed="true" stored="true" />

<copyField source="*_txt_en" dest="fieldspellcheck_en" />

So I sent a query

curl http://localhost:8983/solr/films/spell?spellcheck.q=blak&spellcheck=on

The Response I was expecting includes suggestions including black, blue etc.. but the response I got was

{
  "responseHeader":{
    "status":0,
    "QTime":1},
  "response":{"numFound":0,"start":0,"docs":[]
  },
  "spellcheck":{
    "suggestions":[],
    "correctlySpelled":false,
    "collations":[]}}

No suggestions were returned.

Why am I not getting any suggestions? What are the changes I should do