Fix the problem of Tag selector "=" filter can not match the whole word

[it-linnan]

Motivation:

Tag选择器的“=”筛选，不能实现全字匹配。
比如jvm.threads.daemon{app="foo"}，这样查询
实际结果是，能够查询到foo和gateway等多个应用的时序数据
预期结果是，只查询到foo应用的时序数据

Modification:

使用ES的keyword特性，阻止ES进行分词

Result:

Fixes #83 .

[sofastack-bot]

Hi @it-linnan, we detect non-English characters in the issue. This comment is an auto translation by @sofastack-robot to help other users to understand this issue.

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Motivation: "=" filter of ag selector cannot match whole words. For example, jvm.threads.daemon {app = "foo"}, so that the actual result of the query is that it can query the time series data of multiple applications such as foo and gateway. The expected result is that only the time series data of the foo application can be queried Use ES's keyword feature to prevent ES from tokenizing ### Result: Fixes # 83.

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