分词的posiiton为什么不连续，为什么和原始的词的位置不一样，求解

例如：我在漫步人生，分词为：

{
"tokens": [
{
"token": "w",
"start_offset": 0,
"end_offset": 1,
"type": "word",
"position": 0
},
{
"token": "wo",
"start_offset": 0,
"end_offset": 1,
"type": "word",
"position": 1
},
{
"token": "z",
"start_offset": 1,
"end_offset": 2,
"type": "word",
"position": 2
},
{
"token": "zai",
"start_offset": 1,
"end_offset": 2,
"type": "word",
"position": 3
},
{
"token": "m",
"start_offset": 2,
"end_offset": 3,
"type": "word",
"position": 4
},
{
"token": "man",
"start_offset": 2,
"end_offset": 3,
"type": "word",
"position": 5
},
{
"token": "b",
"start_offset": 3,
"end_offset": 4,
"type": "word",
"position": 6
},
{
"token": "bu",
"start_offset": 3,
"end_offset": 4,
"type": "word",
"position": 7
},
{
"token": "r",
"start_offset": 4,
"end_offset": 5,
"type": "word",
"position": 8
},
{
"token": "ren",
"start_offset": 4,
"end_offset": 5,
"type": "word",
"position": 9
},
{
"token": "s",
"start_offset": 5,
"end_offset": 6,
"type": "word",
"position": 10
},
{
"token": "sheng",
"start_offset": 5,
"end_offset": 6,
"type": "word",
"position": 11
},
{
"token": "wozaimanburensheng",
"start_offset": 0,
"end_offset": 18,
"type": "word",
"position": 12
},
{
"token": "wzmbrs",
"start_offset": 0,
"end_offset": 6,
"type": "word",
"position": 13
}
]
}

问题1：

如果我进行短语搜索不能匹配 “wozaiman” ,需要写成：“wwozzaimman”。

问题2：

理想中的位置：
w，z，，m应该是0，1，2

wo，zai，man也是0，1，2

wozaimanbu是0，

wzmb是0.

能解析一下为什么不是这样吗，谢谢大神。

我不希望把wozaiman 索引成 w，z，m，我希望保留原来的，wo，zai，man，这样不会丢失精度。同时我也希望搜搜wozmbu也能匹配，如果对应的term的位置一致，应该就可以实现吧