public IndexField withIndexFieldName(String indexFieldName) {
        setIndexFieldName(indexFieldName);
        return this;
    }
<p>
A string that represents the name of an index field. CloudSearch supports regular index fields as well as dynamic
fields. A dynamic field's name defines a pattern that begins or ends with a wildcard. Any document fields that
don't map to a regular index field but do match a dynamic field's pattern are configured with the dynamic field's
indexing options.
</p>
<p>
Regular field names begin with a letter and can contain the following characters: a-z (lowercase), 0-9, and _
(underscore). Dynamic field names must begin or end with a wildcard (*). The wildcard can also be the only
character in a dynamic field name. Multiple wildcards, and wildcards embedded within a string are not supported.
</p>
<p>
The name <code>score</code> is reserved and cannot be used as a field name. To reference a document's ID, you can
use the name <code>_id</code>.
</p>

@param indexFieldName
       A string that represents the name of an index field. CloudSearch supports regular index fields as well as
       dynamic fields. A dynamic field's name defines a pattern that begins or ends with a wildcard. Any document
       fields that don't map to a regular index field but do match a dynamic field's pattern are configured with
       the dynamic field's indexing options. </p>
       <p>
       Regular field names begin with a letter and can contain the following characters: a-z (lowercase), 0-9,
       and _ (underscore). Dynamic field names must begin or end with a wildcard (*). The wildcard can also be
       the only character in a dynamic field name. Multiple wildcards, and wildcards embedded within a string are
       not supported.
       </p>
       <p>
       The name <code>score</code> is reserved and cannot be used as a field name. To reference a document's ID,
       you can use the name <code>_id</code>.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-cloudsearch/src/main/java/com/amazonaws/services/cloudsearchv2/model/IndexField.java