Provide a "clearable" option to EuiFieldSearch to support deleting the contents

[wylieconlon]

This is useful for filter-type searches, where the user might need to reset their filters to get back to the default state.

I imagine the presentation of this would take the form of a "clear" button and Esc keybindings, and in terms of API I would expect the default to be false. Something like:

<EuiFieldSearch value={state.filterText} onChange={this.onChange} clearable={true} />

[lozinska]

Hello there!
I would like to work on this issue.

[ryankeairns]

Hi @lozinska , that's great!

Feel free to open a PR. There are instructions in the README with regards to contributing to the EUI project. Also, there was a similar change recently made to the date picker which would provide some direction on the potential solution - #2235

[lozinska]

Thank you