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Adcanced query syntax

The following special operators and modifiers can be used when using the advanced matching mode (CASE-SENSITIVE):

operator OR:
```
   hello | world
```
operator MAYBE:
```
   hello MAYBE world
```
operator NOT:
```
   hello -world
   hello !world
```
phrase search operator (search extract phrase):
```
   "hello world"
```
strict order operator (aka operator "before"):
```
   aaa << bbb << ccc
```
field-start and field-end modifier :
```
   ^hello world$
```
NEAR, generalized proximity operator (NEAR/N, it is case-sensitive, and no spaces are allowed between the NEAR keyword):
```
   hello NEAR/3 world NEAR/4 "my test"
```

Please input keyword