elastic要怎么通过对字段的值进行截取来分组?
https://blog.csdn.net/lw250397846/article/details/103384345?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1-103384345-blog-109239328.pc_relevant_multi_platform_whitelistv3&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1-103384345-blog-109239328.pc_relevant_multi_platform_whitelistv3&utm_relevant_index=1
有现成的