Laravel基于Elasticsearch的包——Elasticquent，使用ik分词的设置问题

使用Laravel基于Elasticsearch的包(https://github.com/elasticquen ... pping ) ,

**问题：**

1、下面这段配置使用ik分词的时候，应该怎么设置呢？
2、下面代码中的analysis、filter、analyzer三个东西的概念和作用是什么？
```
protected $indexSettings = [
'analysis' => [
'char_filter' => [
'replace' => [
'type' => 'mapping',
'mappings' => [
'&=> and '
],
],
],
'filter' => [
'word_delimiter' => [
'type' => 'word_delimiter',
'split_on_numerics' => false,
'split_on_case_change' => true,
'generate_word_parts' => true,
'generate_number_parts' => true,
'catenate_all' => true,
'preserve_original' => true,
'catenate_numbers' => true,
]
],
'analyzer' => [
'default' => [
'type' => 'custom',
'char_filter' => [
'html_strip',
'replace',
],
'tokenizer' => 'whitespace',
'filter' => [
'lowercase',
'word_delimiter',
],
],
],
],
];

```