WordPress database error: [Can't DROP INDEX `application`; check that it exists]
ALTER TABLE wp_nextend2_section_storage DROP INDEX `application`

WordPress database error: [Can't DROP INDEX `application_2`; check that it exists]
ALTER TABLE wp_nextend2_section_storage DROP INDEX `application_2`

WordPress database error: [Can't DROP INDEX `thumbnail`; check that it exists]
ALTER TABLE wp_nextend2_smartslider3_slides DROP INDEX `thumbnail`

WordPress database error: [Duplicate key name 'thumbnail']
ALTER TABLE wp_nextend2_smartslider3_slides ADD INDEX `thumbnail` (`thumbnail`(100))