All I know is that ES have something to do with ES_NCA (or 0100000000000033) but not sure what ES6 is.
EDIT: Checked old backed up sourcecode, ES6 might not be in use anymore therefore not needed on FW18
constinit Patterns es_patterns[] = {
{ "es1", "0x1F90013128928052", -4, 0, cbz_cond, b_patch, b_applied, true, FW_VER_ANY, MAKEHOSVERSION(13,2,1) },
{ "es2", "0xC07240F9E1930091", -4, 0, tbz_cond, nop_patch, nop_applied, true, FW_VER_ANY, MAKEHOSVERSION(10,2,0) },
{ "es3", "0xF3031FAA02000014", -4, 0, bne_cond, nop_patch, nop_applied, true, FW_VER_ANY, MAKEHOSVERSION(10,2,0) },
{ "es4", "0xC0FDFF35A8C35838", -4, 0, mov_cond, nop_patch, nop_applied, true, MAKEHOSVERSION(11,0,0), MAKEHOSVERSION(13,2,1) },
{ "es5", "0xE023009145EEFF97", -4, 0, cbz_cond, b_patch, b_applied, true, MAKEHOSVERSION(11,0,0), MAKEHOSVERSION(13,2,1) },
{ "es6", "0x.6300...0094A0..D1..FF97", 16, 0, mov2_cond, mov0_patch, mov0_applied, true, MAKEHOSVERSION(14,0,0) },
};
So I guess es7 is just a replacement for es6