public void setBackfillMode(String backfillMode) {
        this.backfillMode = backfillMode;
    }
<p>
The method that is used to backfill game sessions created with this matchmaking configuration. Specify MANUAL
when your game manages backfill requests manually or does not use the match backfill feature. Specify AUTOMATIC
to have GameLift create a match backfill request whenever a game session has one or more open slots. Learn more
about manual and automatic backfill in <a
href="https://docs.aws.amazon.com/gamelift/latest/flexmatchguide/match-backfill.html">Backfill Existing Games
with FlexMatch</a>. Automatic backfill is not available when <code>FlexMatchMode</code> is set to
<code>STANDALONE</code>.
</p>

@param backfillMode
       The method that is used to backfill game sessions created with this matchmaking configuration. Specify
       MANUAL when your game manages backfill requests manually or does not use the match backfill feature.
       Specify AUTOMATIC to have GameLift create a match backfill request whenever a game session has one or more
       open slots. Learn more about manual and automatic backfill in <a
       href="https://docs.aws.amazon.com/gamelift/latest/flexmatchguide/match-backfill.html">Backfill Existing
       Games with FlexMatch</a>. Automatic backfill is not available when <code>FlexMatchMode</code> is set to
       <code>STANDALONE</code>.
@see BackfillMode
aws-java-sdk-gamelift/src/main/java/com/amazonaws/services/gamelift/model/UpdateMatchmakingConfigurationRequest.java